An electron is moving along the axis of a solenoid carrying a current which of the following is a correct statement about the electromagnetic force acting on the electron?

The force acts perpendicular to its motion

The force acts anti-parallel to its motion

The force acts in the direction of motion

A maintenance crew is working on a section of a three-lane highway only lane open to traffic. The result is much slower traffic flow. Do cars on a highway behave like:

the molecules of a compressed fluid

the molecules of an incompressible fluid

Which is the most accurate statement of the Bernoulli's principle?

lower pressure causes fast moving air

fast-moving air causes low pressure

lower pressure causes no effect

The mass of alpha-particle is :

less than sum of the masses of two protons and two neutrons

equal to the mass of four protons

equal to the mass of four neutrons

equal to the sum of masses of four neucleons

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When the output power equals to one-half of the input power, efficiency of the transformer becomes:
- 0 %
- 100 %
- 50 %
- 200 %

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2.

At which of the following places, motion of simple pendulum becomes slowest:
- Murree
- Karachi
- K-2
- Peshawar
Correct Answer

A. K-2

Explanation

The motion of a simple pendulum becomes slowest at K-2. This is because K-2 is the highest peak in the Karakoram mountain range, located in Pakistan. As the pendulum reaches higher altitudes, the acceleration due to gravity decreases, causing the pendulum's motion to slow down. Therefore, the motion of a simple pendulum becomes slowest at higher altitudes such as K-2.

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3.

Let an emf of 120 volt of negligible internal resistance connected across a resistance of 1000 ohm. Then the current flowing through the circuit will be:
- 120 A
- None
Correct Answer

A.

Explanation

The current flowing through the circuit can be calculated using Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R). In this case, the voltage is 120 volts and the resistance is 1000 ohms. Therefore, the current flowing through the circuit is 120 volts divided by 1000 ohms, which is 0.12 amperes or 120 milliamperes.

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4.

Equation of SHM, with amplitude 'a' is given by:
Correct Answer

A.

Explanation

The equation of Simple Harmonic Motion (SHM) with amplitude 'a' is given by the equation: x = a * cos(ωt), where x represents the displacement of the oscillating object at time 't' and ω is the angular frequency. This equation describes the periodic motion of an object back and forth around its equilibrium position with a maximum displacement of 'a'. The cosine function is used because it provides the oscillatory behavior with a periodic nature.

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5.

A logic gate has four inputs, its possible input combination will be:
- 4
- 16
- 32
- 64
Correct Answer

A. 16

Explanation

A logic gate with four inputs can have a total of 2^4 = 16 possible input combinations. This is because each input can have two possible states (0 or 1), and there are four inputs in total. Therefore, the correct answer is 16.

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6.

An electron is moving along the axis of a solenoid carrying a current which of the following is a correct statement about the electromagnetic force acting on the electron?
- The force acts perpendicular to its motion
- The force acts anti-parallel to its motion
- The force acts in the direction of motion
- No force acts
Correct Answer

A. The force acts perpendicular to its motion

Explanation

When an electron is moving along the axis of a solenoid carrying a current, the electromagnetic force acting on the electron is perpendicular to its motion. This is because the magnetic field produced by the current in the solenoid interacts with the moving charge of the electron, resulting in a force that is perpendicular to the direction of motion.

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7.

A maintenance crew is working on a section of a three-lane highway only lane open to traffic. The result is much slower traffic flow. Do cars on a highway behave like:
- The molecules of an incompressible fluid
- The molecules of a compressed fluid
- Both (a) and (b)
- None of the above
Correct Answer

A. The molecules of a compressed fluid

Explanation

Cars on a highway behave like the molecules of a compressed fluid. When a maintenance crew is working on a section of a three-lane highway and only one lane is open to traffic, it creates congestion and slower traffic flow. This is similar to how molecules behave in a compressed fluid, where the molecules are closely packed together and the flow is restricted. In this scenario, the cars on the highway experience increased density and reduced flow, similar to the behavior of molecules in a compressed fluid.

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8.

When an observer move with velocity of light relative to a timing device at rest, he would notice:
- Absolute time
- Improper time
- Infinite time
- Proper time
Correct Answer

A. Infinite time

Explanation

According to the theory of relativity, as an observer approaches the speed of light, time dilation occurs. This means that time appears to slow down for the observer in motion relative to a stationary timing device. As the observer's velocity approaches the speed of light, the time dilation effect becomes more pronounced, leading to the perception of time becoming infinite. Therefore, the observer would notice infinite time relative to the timing device at rest.

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9.

When one of the following particles projected perpendicular to a uniform magnetic field with the same velocity. Which will be deflected least :
- Alpha- particles
- Deutron
- Electrons
- Proton
Correct Answer

A. Alpha- particles

Explanation

Alpha particles will be deflected least because they have the highest mass and charge compared to the other particles. According to the Lorentz force equation, the deflection experienced by a charged particle moving through a magnetic field is directly proportional to its charge and velocity, and inversely proportional to its mass. Since alpha particles have the highest mass and charge among the given particles, they will experience the least deflection.

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10.

Which Graph in SHM show K.E of body:
- None
Correct Answer

A.
11.

A light and a heavy body have equal momentum, which one has greater kinetic energy:
- Light Body
- Heavy Body
- Both Have Equal K.E.
- Cannot be Predicted
Correct Answer

A. Light Body

Explanation

The light body has greater kinetic energy. Kinetic energy is directly proportional to the mass of the object. Since both bodies have equal momentum, which is the product of mass and velocity, the light body must have a higher velocity than the heavy body to compensate for its lower mass. As kinetic energy depends on both mass and velocity, the light body with higher velocity will have greater kinetic energy than the heavy body.

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12.

A two Kg body and a 3 Kg body have equal momentum. If the Kinetic Energy of 3 kg body is 10 J The K.E. of 2 Kg body is:
- 6.66 J
- 15 J
- 22.5 J
- 45 J
- 93,7 J
Correct Answer

A. 15 J

Explanation

The kinetic energy of an object is directly proportional to its mass. Therefore, if the kinetic energy of the 3 kg body is 10 J, and the 2 kg body has less mass, its kinetic energy will be less as well. Since the masses are in a ratio of 2:3, we can calculate the kinetic energy of the 2 kg body by multiplying the given kinetic energy (10 J) by the ratio of the masses (2/3). This gives us a kinetic energy of 6.66 J, which is closest to the option 6.66 J. However, since the options are given in whole numbers, the closest option is 15 J.

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13.

According to equation, , the value of x after 4 seconds is:
- 0.25 m
- 0.18 m
- Zero
- 1 m
Correct Answer

A. Zero

Explanation

The equation mentioned in the question suggests that the value of x after 4 seconds is zero.

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14.

If a body is moving with acceleration 10 m/ starting from rest, then the distance covered in 5th second is:
- 45 m
- 65 m
- 35 m
- 98 m
- 10 m
Correct Answer

A. 45 m

Explanation

When a body is moving with a constant acceleration and starting from rest, the distance covered in the nth second can be calculated using the formula: distance = (1/2) * acceleration * (time)^2. In this case, the acceleration is given as 10 m/s^2 and we need to find the distance covered in the 5th second. Plugging in the values, we get: distance = (1/2) * 10 * (5)^2 = 45 m. Therefore, the correct answer is 45 m.

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15.

If speed of the coil in A.C generator is doubled the r.m.s value of current become:
- Half
- Four Time
- Double
- One fourth time
Correct Answer

A. Double

Explanation

When the speed of the coil in an AC generator is doubled, it means that the coil is rotating at a faster rate. This increased speed leads to a higher frequency of the alternating current produced by the generator. The root mean square (r.m.s) value of current is directly proportional to the frequency of the alternating current. Therefore, when the speed of the coil is doubled, the r.m.s value of the current also doubles.

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16.

As temperature of the black body is raised the black body radiations become richer in :
- Intermediate Wavelenths
- Longer Wavelengths
- Shorter Wavelengths
- Low Frequencies
Correct Answer

A. Shorter Wavelengths

Explanation

As the temperature of a black body is raised, the black body radiations become richer in shorter wavelengths. This is because as the temperature increases, the particles in the black body gain more energy and vibrate at a higher frequency, resulting in the emission of shorter wavelength radiations.

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17.

Most of the mass of fly wheel is concentrated at its rim so as to have:
Correct Answer

A.

Explanation

A higher mass concentration at the rim of a flywheel allows for greater rotational inertia. This means that the flywheel will have more resistance to changes in its rotational motion. This is important for applications such as energy storage or maintaining a steady rotational speed in machines. By concentrating the mass at the rim, the flywheel can store more rotational energy and provide a more stable and efficient performance.

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18.

To double the total energy for a mass spring system oscillating in SHM, by what factor must the amplitude increase?
- 4
- 2
Correct Answer

A.

Explanation

To double the total energy for a mass spring system oscillating in SHM, the amplitude must increase by a factor of 2. This is because the total energy of a mass spring system in SHM is directly proportional to the square of the amplitude. Therefore, if the amplitude is doubled, the total energy will increase by a factor of 2^2, which is 4.

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19.

Two meters high cylinder containing water is hit by four bullets of same caliber at 1.2 m , 1.8 m, 0.6 m and 0.3 m above the ground. The speed of efflux is maximum for:
- 1.2 m high hole
- 1.8 m high hole
- 0.6 m high hole
- 0.3 m high hole
Correct Answer

A. 0.3 m high hole

Explanation

The speed of efflux refers to the speed at which water flows out of the hole. In this case, the height of the hole determines the pressure at which the water flows out. The higher the hole, the greater the pressure and therefore the greater the speed of efflux. Since the 0.3 m high hole is the lowest, it will have the highest pressure and therefore the maximum speed of efflux.

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20.

Two points charges of +5 C and -12 C attract each other with a force of 1.48 N. charge of -5C is added to each of these charges. Now the force will be:
- 1.48 N(attractive)
- 1.48 N(repulsive)
- 2.96 (repulsive)
- Zero
Correct Answer

A. Zero

Explanation

When a charge of -5C is added to each of the charges, the total charge on each charge becomes 0C. Since like charges repel each other, the force between the charges will be zero as the charges are now neutral.

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21.

Which is the most accurate statement of the Bernoulli's principle?
- Fast-moving air causes low pressure
- Lower pressure causes fast moving air
- Lower pressure causes no effect
- Both (a) and (b)
Correct Answer

A. Lower pressure causes fast moving air

Explanation

According to Bernoulli's principle, lower pressure causes fast-moving air. This principle states that as the speed of a fluid (such as air) increases, its pressure decreases. Therefore, when the pressure is lower, the air tends to move at a faster speed. This principle is commonly observed in various phenomena, such as the lift generated by an airplane wing or the flow of air over a curved surface.

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22.

A body released from a height takes time to reach earth's surface. The time taken by the same body released from the same height to reach the moon surface is:
Correct Answer

A.

Explanation

The time taken by the body to reach the moon surface will be longer than the time taken to reach the Earth's surface. This is because the moon has a weaker gravitational pull compared to the Earth. The weaker gravitational pull means that the body will experience less acceleration towards the moon and therefore take a longer time to reach its surface.

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23.

Equation of displacement of a body executing SHM is . Which of the following displacement-time graph satisfy this equation.
- None
Correct Answer

A.
24.

If power dissipated by an A.C circuit is 50 W and power supplied to the circuit is 100 W, then phase angle between voltage and current in the circuit is:
Correct Answer

A.

Explanation

The phase angle between voltage and current in an AC circuit can be determined using the power factor. The power factor is the ratio of the power dissipated to the power supplied. In this case, the power dissipated is 50 W and the power supplied is 100 W. Therefore, the power factor is 50/100 = 0.5. The phase angle can be calculated using the inverse cosine of the power factor. However, without the specific power factor value, it is not possible to determine the exact phase angle.

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25.

The % uncertainty for value of V and I is 2 % and 6% respectively. Hence %age uncertainty in the value of R=V/I is:
- 8%
- 1/3%
- 4%
- 12%
- 1/6%
Correct Answer

A. 8%

Explanation

The percentage uncertainty in the value of R can be calculated by adding the percentage uncertainties in the values of V and I. Since the percentage uncertainty for V is 2% and for I is 6%, the total percentage uncertainty in R is 2% + 6% = 8%. Therefore, the correct answer is 8%.

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26.

The mass of alpha-particle is :
- Less than sum of the masses of two protons and two neutrons
- Equal to the mass of four protons
- Equal to the mass of four neutrons
- Equal to the sum of masses of four neucleons
Correct Answer

A. Less than sum of the masses of two protons and two neutrons

Explanation

The mass of an alpha particle is less than the sum of the masses of two protons and two neutrons because during the formation of an alpha particle, a small amount of mass is converted into energy according to Einstein's mass-energy equivalence principle (E=mc^2). This energy is released in the form of binding energy, which reduces the overall mass of the alpha particle compared to the individual masses of the protons and neutrons.

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27.

The number of LED segments used in a Calculator Display:
- 8
- 10
- 7
- None
Correct Answer

A. 7

Explanation

A calculator display typically consists of seven segments that can be illuminated to form different numbers and symbols. These segments include a horizontal line at the top, a horizontal line at the bottom, and five vertical lines in between. Therefore, the correct answer is 7, as it represents the number of LED segments used in a calculator display.

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28.

An electron has angular momentum js in nth shell of h atom the value of n is
- 2
- 3
- 4
- 5
Correct Answer

A. 3

Explanation

The value of n represents the principle quantum number, which determines the energy level and size of an electron's orbital in an atom. In this question, it is stated that the electron has angular momentum in the nth shell of a hydrogen atom. Since the answer is 3, it suggests that the electron is in the third shell (n=3) of the hydrogen atom, which corresponds to the 3s orbital.

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29.

A disc, a hoop and a sphere of same mass and radius are rolled down from a frictionless inclined plane. Which has greater speed on reaching the ground:
- Disc
- Loop
- Sphere
- All have same speed
Correct Answer

A. Sphere

Explanation

The sphere has the greater speed on reaching the ground. This is because the sphere has the least rotational inertia compared to the disc and the hoop. As a result, more of its mass is concentrated towards its center, allowing it to roll down the inclined plane more easily and gain more speed. The disc and the hoop have more mass distributed farther away from the center, resulting in a higher rotational inertia and slower speed when rolling down the inclined plane.

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30.

When A and B are perpendicular to each other then magnitude of A x B is equal to:
- Area of Paralellogram
- Area of Triangle
- Area of Circle
- Area of Rectangle
Correct Answer

A. Area of Rectangle

Explanation

When A and B are perpendicular to each other, the magnitude of their cross product (A x B) is equal to the area of the rectangle formed by A and B. This is because the cross product of two vectors gives a vector that is perpendicular to both of the original vectors and its magnitude is equal to the product of the magnitudes of the original vectors and the sine of the angle between them. In this case, since A and B are perpendicular, the sine of the angle between them is 1, resulting in the magnitude of A x B being equal to the product of the magnitudes of A and B, which represents the area of the rectangle.

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31.

According to Einstein bodies and Light rays follow:
- Rectilinear Path
- Circular Path
- Geodesics
- Parabolic
Correct Answer

A. Geodesics

Explanation

Geodesics refer to the shortest or straightest paths in curved space. According to Einstein's theory of general relativity, bodies and light rays follow geodesics in the presence of gravitational fields. This means that they follow curved paths in spacetime, rather than strictly rectilinear or circular paths. Geodesics are influenced by the curvature of spacetime caused by massive objects, causing bodies and light to curve around them. This explanation aligns with Einstein's theory and provides a logical reasoning for why geodesics are the correct answer in this context.

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32.

In RLC series circuit at resonance the voltage across R, L and C are 10 V, 30 V and 30 V respectively then applied voltage will be :
- 30 V
- 10 V
- 40 V
- 20 V
Correct Answer

A. 10 V

Explanation

In an RLC series circuit at resonance, the voltage across the inductor (L) and the capacitor (C) is equal, while the voltage across the resistor (R) is different. In this case, the voltage across the resistor is given as 10 V, which means that the applied voltage will also be 10 V.

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33.

There resistors each of one ohm are connected to form a triangle. The resistance between any two terminals is:
- 1.01 ohm
- 1 ohm
- 3/2 ohm
- 2/3 ohm
Correct Answer

A. 1 ohm

Explanation

When three resistors of one ohm each are connected to form a triangle, the resistance between any two terminals is equal to the resistance of a single resistor, which is one ohm. This is because when resistors are connected in a triangle configuration, the total resistance is determined by the equivalent resistance formula for resistors in parallel, which is the reciprocal of the sum of the reciprocals of the individual resistances. In this case, since all three resistors have the same resistance of one ohm, the equivalent resistance between any two terminals is also one ohm.

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34.

Waves used for radio transmission have wavelength :
- Greater than that of infra-red rays
- Smaller than that of infra-red rays
- Smaller than that of ultraviolet rays
- Smaller than that of gamma rays
Correct Answer

A. Greater than that of infra-red rays

Explanation

Radio waves have a longer wavelength than infrared rays. Wavelength is the distance between two consecutive points of a wave, and it is inversely proportional to the frequency of the wave. Radio waves have a lower frequency and longer wavelength compared to infrared rays. This is why radio waves are able to travel long distances and penetrate obstacles like buildings, while infrared rays have a shorter range.

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35.

The ratio of dimension of Power to the dimension of Angular Momentum is equal to:
Correct Answer

A.

Explanation

The ratio of the dimension of Power to the dimension of Angular Momentum is equal to the reciprocal of the dimension of time. This can be explained by examining the units of each quantity. Power is measured in watts (W), which is equal to joules per second (J/s). Angular momentum is measured in kilogram meters squared per second (kg·m²/s). Therefore, the ratio of Power to Angular Momentum is (J/s) / (kg·m²/s), which simplifies to (J·s) / (kg·m²). Since the dimension of time is represented by seconds (s), the ratio is equal to the reciprocal of the dimension of time.

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36.

A small drop falls from a height "h" in air. The final velocity is:
- Option 2
Correct Answer

A.
37.

At very high frequency of A.C through RLC series circuit, the circuit behaves like:
- Resistive circuit
- RL series circuit
- RC series circuit
- LC series circuit
Correct Answer

A. RL series circuit

Explanation

At very high frequency, the reactance of the inductor in the RLC series circuit becomes dominant, causing the circuit to behave like an RL series circuit. In an RL series circuit, the inductor's reactance opposes the flow of current, leading to a phase shift between the voltage and current. This behavior is similar to what happens in a high-frequency RLC series circuit, where the inductor's reactance is significant compared to the resistance and capacitance in the circuit.

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38.

In the Formula of Velocity of Efflux , h is the:
- Height of orifice from the bottom of the vessel
- Height of the liquid column above the orifice
- Height of Liquid Column
- None of Given
Correct Answer

A. Height of the liquid column above the orifice

Explanation

The correct answer is "Height of the liquid column above the orifice." In the formula of velocity of efflux, h represents the height of the liquid column above the orifice. This is the distance from the top surface of the liquid to the orifice through which the liquid is flowing. The height of the orifice from the bottom of the vessel is not relevant in this formula.

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39.

Which of the Following Represent tanθ ?
Correct Answer

A.
40.

Two resistances and are connected in series across the battery, of a voltage V then Potential Difference Across will be:
- Cannot Be Determine
Correct Answer

A.

Explanation

The potential difference across a resistance in a series circuit is determined by the voltage of the battery and the value of the resistance. Since the values of the resistances are not given in the question, it is not possible to determine the potential difference across either resistance.

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41.

An A.C of rms value of 4 A and a D.C current 1 flowing through identical resistors dissipate heat at the same rate then value of 1 will be:
- 4 A
- 2 A
Correct Answer

A. 4 A

Explanation

The given question states that an A.C current of 4 A and a D.C current of 1 A flowing through identical resistors dissipate heat at the same rate. This implies that the power dissipated in both cases is equal. The power dissipated in a resistor can be calculated using the formula P = I^2 * R, where P is power, I is current, and R is resistance. Since the resistance is the same for both cases, and the power is the same, we can equate the equations for A.C and D.C currents: (4^2) * R = (1^2) * R. Simplifying this equation, we get 16R = R, which implies that 16 = 1. This is not possible, so the only logical explanation is that the given question is incorrect or incomplete.

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42.

An A.C emf of V=200 sin (100πt) volt is concerned to a choke of negligible resistance. In order to produce current of amplitude 1 A, the inductance of choke should be:
- 200 H
- 2/π H
- 1/π H
- √2/π H
Correct Answer

A. 2/π H

Explanation

To find the inductance of the choke, we can use the formula V = L di/dt, where V is the voltage, L is the inductance, and di/dt is the rate of change of current. In this case, the voltage is given as V = 200 sin(100πt) volts and the current amplitude is given as 1 A.

To find the rate of change of current, we take the derivative of the current with respect to time. The derivative of sin(100πt) is 100π cos(100πt).

Setting V = L di/dt, we have 200 sin(100πt) = L (100π cos(100πt)).

Simplifying, we get L = 200 / (100π cos(100πt) / sin(100πt)).

Since we want the inductance for the current amplitude of 1 A, we can substitute sin(100πt) = 1 and cos(100πt) = 0.

Therefore, L = 200 / (100π * 0 / 1) = 2/π H.

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43.

An artificial satellite is orbiting the earth, What can be guess about this artificial Satellite:
- Centripetal Acceleration is Zero
- Tangential Acceleration is Zero
- Angular Acceleration is Zero
- Angular and Tangential Acceleration is Zero
Correct Answer

A. Angular and Tangential Acceleration is Zero

Explanation

When an artificial satellite is in orbit around the Earth, its motion is characterized by a constant speed and a constant distance from the Earth. This means that the satellite is moving in a circular path at a constant speed, resulting in a centripetal acceleration towards the Earth. However, since the satellite's speed is constant, there is no change in its tangential velocity, leading to zero tangential acceleration. Additionally, since the satellite is moving in a circular path at a constant speed, there is no change in its angular velocity, resulting in zero angular acceleration as well. Therefore, the correct answer is that both angular and tangential acceleration are zero.

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44.

An electron describes a circular orbits of radius 2 cm in a uniform magnetic field. If speed of electron is doubled then radius of the orbit will:
- 0.5 cm
- 1 cm
- 2 cm
- 4 cm
Correct Answer

A. 0.5 cm

Explanation

When the speed of the electron is doubled, the centripetal force required to keep the electron in circular motion also doubles. According to the equation for centripetal force, F = (mv^2)/r, where m is the mass of the electron, v is its velocity, and r is the radius of the orbit. Since the mass of the electron remains constant, the only way for the centripetal force to double is for the radius to halve. Therefore, if the speed of the electron is doubled, the radius of the orbit will become 0.5 cm.

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45.

For a radioactive element, the percentage of decade nuclei after 3 half lives is:
- 75 %
- 25 %
- 12.5 %
- 87.5 %
Correct Answer

A. 87.5 %

Explanation

The percentage of remaining nuclei after each half-life is 50%. After 3 half-lives, the remaining nuclei would be (0.5)^3 = 0.125 or 12.5%. However, the question asks for the percentage of decayed nuclei, which is the complement of the remaining nuclei. Therefore, the percentage of decayed nuclei after 3 half-lives would be 100% - 12.5% = 87.5%.

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46.

The six strings of a guitar are the same length under nearly the same tension, but they have different thickness. On which string do waves travel the fastest?
- The thickest string
- The thinnest string
- The wave speed is the same on all the strings
- None of the above
Correct Answer

A. The thickest string

Explanation

The waves travel the fastest on the thickest string because the speed of a wave is directly proportional to the tension and inversely proportional to the mass per unit length of the string. Since all the strings have the same tension but different thickness, the thickest string will have the lowest mass per unit length, resulting in the highest wave speed.

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47.

The ratio of angular speed of moon around the Earth to its angular speed about its own axis is :
- 2 : 1
- 1 : 6
- 1 : 30
- 1 : 1
Correct Answer

A. 1 : 1

Explanation

The ratio of the angular speed of the moon around the Earth to its angular speed about its own axis is 1:1. This means that the moon takes the same amount of time to complete one rotation around the Earth as it does to complete one rotation about its own axis. Therefore, the angular speed of the moon remains constant and does not change relative to either the Earth or itself.

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48.

Two spheres of the same size, one of mass 5 kg and other of mass 50 g are dropped simultaneously from a tower. When they are about to touch the ground, they have the same:
- Kinetic Energy
- Potential Energy
- Momentum
- Acceleration
- All Given Options
Correct Answer

A. Acceleration

Explanation

When the two spheres are dropped simultaneously, they experience the same acceleration due to gravity. This is because the acceleration due to gravity is independent of the mass of the object. Therefore, both spheres will have the same acceleration when they are about to touch the ground.

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49.

A square coil of side 16 cm has 200 turns and rotates in a uniform magnetic field of magnitude 0.05 T. If the peak emf is 12 V, what is the angular velocity of the coil?
Correct Answer

A.

Explanation

The angular velocity of the coil can be determined using the formula for peak emf in a rotating coil, which is given by emf = N * B * A * ω, where N is the number of turns, B is the magnetic field magnitude, A is the area of the coil, and ω is the angular velocity. Rearranging the formula, we can solve for ω by dividing both sides by (N * B * A). Plugging in the given values, we get ω = emf / (N * B * A) = 12 V / (200 * 0.05 T * (0.16 m)^2) = 375 rad/s.

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Physics Test -1 Full Book By Taleem Tutor

When the output power equals to one-half of the input power, efficiency of the transformer becomes:

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At which of the following places, motion of simple pendulum becomes slowest:

Let an emf of 120 volt of negligible internal resistance connected across a resistance of 1000 ohm. Then the current flowing through the circuit will be:

Equation of SHM, with amplitude 'a' is given by:

A logic gate has four inputs, its possible input combination will be:

An electron is moving along the axis of a solenoid carrying a current which of the following is a correct statement about the electromagnetic force acting on the electron?

A maintenance crew is working on a section of a three-lane highway only lane open to traffic. The result is much slower traffic flow. Do cars on a highway behave like:

When an observer move with velocity of light relative to a timing device at rest, he would notice:

When one of the following particles projected perpendicular to a uniform magnetic field with the same velocity. Which will be deflected least :

Which Graph in SHM show K.E of body:

A light and a heavy body have equal momentum, which one has greater kinetic energy:

A two Kg body and a 3 Kg body have equal momentum. If the Kinetic Energy of 3 kg body is 10 J The K.E. of 2 Kg body is:

According to equation, , the value of x after 4 seconds is:

If a body is moving with acceleration 10 m/ starting from rest, then the distance covered in 5th second is:

If speed of the coil in A.C generator is doubled the r.m.s value of current become:

As temperature of the black body is raised the black body radiations become richer in :

Most of the mass of fly wheel is concentrated at its rim so as to have:

To double the total energy for a mass spring system oscillating in SHM, by what factor must the amplitude increase?

Two meters high cylinder containing water is hit by four bullets of same caliber at 1.2 m , 1.8 m, 0.6 m and 0.3 m above the ground. The speed of efflux is maximum for:

Two points charges of +5 C and -12 C attract each other with a force of 1.48 N. charge of -5C is added to each of these charges. Now the force will be:

Which is the most accurate statement of the Bernoulli's principle?

A body released from a height takes time to reach earth's surface. The time taken by the same body released from the same height to reach the moon surface is:

Equation of displacement of a body executing SHM is . Which of the following displacement-time graph satisfy this equation.

If power dissipated by an A.C circuit is 50 W and power supplied to the circuit is 100 W, then phase angle between voltage and current in the circuit is:

The % uncertainty for value of V and I is 2 % and 6% respectively. Hence %age uncertainty in the value of R=V/I is:

The mass of alpha-particle is :

The number of LED segments used in a Calculator Display:

An electron has angular momentum js in nth shell of h atom the value of n is

A disc, a hoop and a sphere of same mass and radius are rolled down from a frictionless inclined plane. Which has greater speed on reaching the ground:

When A and B are perpendicular to each other then magnitude of A x B is equal to:

According to Einstein bodies and Light rays follow:

In RLC series circuit at resonance the voltage across R, L and C are 10 V, 30 V and 30 V respectively then applied voltage will be :

There resistors each of one ohm are connected to form a triangle. The resistance between any two terminals is:

Waves used for radio transmission have wavelength :

The ratio of dimension of Power to the dimension of Angular Momentum is equal to:

A small drop falls from a height "h" in air. The final velocity is:

At very high frequency of A.C through RLC series circuit, the circuit behaves like:

In the Formula of Velocity of Efflux , h is the:

Which of the Following Represent tanθ ?

Two resistances and are connected in series across the battery, of a voltage V then Potential Difference Across will be:

An A.C of rms value of 4 A and a D.C current 1 flowing through identical resistors dissipate heat at the same rate then value of 1 will be:

An A.C emf of V=200 sin (100πt) volt is concerned to a choke of negligible resistance. In order to produce current of amplitude 1 A, the inductance of choke should be:

An artificial satellite is orbiting the earth, What can be guess about this artificial Satellite:

An electron describes a circular orbits of radius 2 cm in a uniform magnetic field. If speed of electron is doubled then radius of the orbit will:

For a radioactive element, the percentage of decade nuclei after 3 half lives is:

The six strings of a guitar are the same length under nearly the same tension, but they have different thickness. On which string do waves travel the fastest?

The ratio of angular speed of moon around the Earth to its angular speed about its own axis is :

Two spheres of the same size, one of mass 5 kg and other of mass 50 g are dropped simultaneously from a tower. When they are about to touch the ground, they have the same:

A square coil of side 16 cm has 200 turns and rotates in a uniform magnetic field of magnitude 0.05 T. If the peak emf is 12 V, what is the angular velocity of the coil?