Pre-ecat Mock Test (Phy/Chem/Math/English)

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. Assalam O Alikum!Respected Members,Read the following instructions carefully. Avoid from internet usage during test. Avoid from seeking help from any sort of assisting source. Please make sure that you've electricity free loading shedding duration in which you're attempting this test, because this test is only set for once attempt trend. Place a ball pen and a paper sheet with you while attempting the test. Don't be distracted. Synchronize yourself with system clock. You're permitted to go Next/back without any restriction. You can attempt according to your own choice. Grading system: Total marks: 400 Negative marking: -1 Un-Attempted Question: -4 Wrong question: -5 (4 marks cut off for Q. And -1 for negative mark) Total Time allowed: 100 minutes (1 hr 40 mins) Automated Grading systemNote: It should be cleared that there are only 100 minutes are allowed for test completion. No grace time will be entertained you, as this is automatic grading and time based mock test which is only set for 100 minutes. So keep this fact always in your mind while attempting this test. We hope that this mock test would be best in your preparation checking and time synchronizing. May ALLAH bear fruit to your hard work and determination (Aameen!)Keep us in your sincere prayers #JazaKALLAHBilKhaerBest of luck for your ECAT-2018. Administrators"Ecat/Net Aspirants"This test is designed by "Ecat/Net Aspirants" and "HOPE"

Pre-ecat Mock Test (Phy/Chem/Math/English) - Quiz

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2.

When water freezes, it occupies
- A) 9% more space
- B) 9% less space
- C) Same amount of space
- D) None of the above
Correct Answer

A. A) 9% more space

Explanation

When water freezes, it expands and occupies 9% more space. This is due to the formation of ice crystals, which have a larger molecular structure compared to liquid water. As the water molecules arrange themselves in a more ordered pattern, they create empty spaces between them, leading to an increase in volume. This expansion is why ice floats on water, as its density decreases when it freezes.

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1
3.

Molarity of pure water is:
- A) 1
- B) 18
- C) 55.5
- D) 6
Correct Answer

A. C) 55.5

Explanation

The molarity of a solution is defined as the number of moles of solute per liter of solution. Pure water does not contain any solute, so its molarity is zero. However, in practice, pure water is slightly ionized into H+ and OH- ions. The concentration of these ions in pure water is very small, but it is still present. The concentration of H+ and OH- ions in pure water is equal and is approximately 1 x 10^-7 moles per liter. Since the molarity is defined as moles of solute per liter of solution, the molarity of pure water is equal to the concentration of H+ or OH- ions, which is approximately 1 x 10^-7 M. However, for simplicity, this value is often rounded to 1 x 10^-7 M, which is approximately equal to 55.5 M when rounded to two significant figures.

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1
4.

Two straight lines are given as: M: y=3x+1 N: y=-1/3 x +2 which of the following statement is correct then:
- A) M and N are parallel
- B) M and N are perpendicular
- C) M and N are not intersected
- D) M and N are intersected
Correct Answer

A. B) M and N are perpendicular

Explanation

The correct answer is B) M and N are perpendicular. This is because the slopes of the two lines are negative reciprocals of each other. The slope of line M is 3, and the slope of line N is -1/3. When two lines have slopes that are negative reciprocals, they are perpendicular to each other.

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1
5.

More than one crystalline form of an element:
- A) Isomorph
- B) Allotrop
- C) Polymorph
- D) None of the above
Correct Answer

A. B) Allotrop

Explanation

Allotropy refers to the phenomenon where an element can exist in multiple crystalline forms. These different forms, known as allotropes, have distinct physical and chemical properties. Examples include carbon, which can exist as diamond, graphite, or fullerenes, and oxygen, which can exist as O2 or O3 (ozone). Therefore, option B) Allotrop is the correct answer as it accurately describes the presence of more than one crystalline form of an element.

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2
6.

Which of these polymers is a synthetic polymer?
- A) Animal fat
- B) Starch
- C) Cellulose
- D) Polyester
Correct Answer

A. D) Polyester

Explanation

Polyester is a synthetic polymer because it is made through a chemical process called polymerization, where monomers are combined to form long chains. It is not found naturally in the environment and is commonly used in the production of fabrics, bottles, and other materials. In contrast, animal fat, starch, and cellulose are all naturally occurring polymers that can be found in plants or animals.

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7.

The number of bonds in nitrogen molecule is:
- A) one sigma and one pie bond
- B) one sigma and two pie bond
- C) three sigma bonds only
- D) two sigma and one pie bond.
Correct Answer

A. B) one sigma and two pie bond

Explanation

Nitrogen molecule (N2) consists of two nitrogen atoms, which are connected by a triple bond. A triple bond is made up of one sigma bond and two pi bonds. The sigma bond is formed by the overlap of two atomic orbitals head-on, while the pi bonds are formed by the sideways overlap of p orbitals. Therefore, the correct answer is B) one sigma and two pi bonds.

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8.

Which catalyst is used in contact process?
- A)
- B)
- C)
- D)
Correct Answer

A. B)
9.

Keeping in view the size of atoms, which order is correct one:
- A) Mg > Sr
- B) Ba > Mg
- C) Lu > Ce
- D) Cl > I
Correct Answer

A. B) Ba > Mg

Explanation

The size of atoms generally increases as you move down a group in the periodic table and decreases as you move across a period from left to right. Ba (Barium) is located below Mg (Magnesium) in the periodic table, so Ba is expected to have a larger atomic size compared to Mg. Therefore, the order Ba > Mg is correct.

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1
10.

The main pollutant of leather tanneries in the waste water is due to the salt of:
- A) Lead
- B) Chromium (VI)
- C) Copper
- D) Chromium (III)
Correct Answer

A. B) Chromium (VI)

Explanation

The main pollutant in the waste water of leather tanneries is chromium (VI). Chromium (VI) is commonly used in the tanning process as a tanning agent. However, it is highly toxic and can cause serious environmental and health problems. When the waste water from tanneries is discharged without proper treatment, it can contaminate water bodies and soil, posing a threat to aquatic life and human health. Therefore, the presence of chromium (VI) in the waste water of leather tanneries is a significant concern.

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11.

When acetylene is heated at 300*C in copper tube, the product obtained is:
- A) Benzene
- B) Thiophene
- C) Xylene
- D) Cresol
Correct Answer

A. A) Benzene

Explanation

When acetylene is heated at 300°C in a copper tube, it undergoes a process called pyrolysis, which results in the formation of benzene. This is because acetylene can polymerize and rearrange its structure to form benzene rings under high temperatures. Therefore, the correct answer is A) Benzene.

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1
12.

The number of moles of which contains 8.0 g of oxygen
- A) 0.25
- B) 0.50
- C) 1.0
- D) 1.50
Correct Answer

A. A) 0.25

Explanation

The molar mass of oxygen is 16 g/mol. To find the number of moles, we divide the given mass of 8.0 g by the molar mass. 8.0 g / 16 g/mol = 0.5 mol. Therefore, the correct answer is A) 0.25.

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1
13.

Passage#1 By Reading this passage, answer the following question. Q#92: Friendship leads to happiness. Is it true?
- A) Yes, researches have proven that friendship does lead to happiness
- B) No, there is no relationship between friendship and happiness
- C) Friends cannot make each other happy
- D) One needs to find one’s happiness alone, with peace of mind
Correct Answer

A. A) Yes, researches have proven that friendship does lead to happiness

Explanation

Research has shown that friendship does lead to happiness. This suggests that having friends can positively impact one's overall well-being and emotional state. Friends provide support, companionship, and a sense of belonging, all of which contribute to feelings of happiness. Therefore, it is true that friendship leads to happiness, as proven by research.

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1
14.

Find the area b/w x-axis and curve y=4x-x² is:
- 28/3
- 32/3
- 25/3
- 96/3
Correct Answer

A. 32/3

Explanation

The area between the x-axis and the curve y=4x-x^2 can be found by integrating the equation from the x-values where the curve intersects the x-axis. In this case, the curve intersects the x-axis at x=0 and x=4. Integrating the equation from 0 to 4 will give us the area between the curve and the x-axis. Evaluating the integral, we get the answer as 32/3.

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15.

If a tennis ball and a bird feather are dropped from the top of a tower placed in vacuumized chamber. Which will reach the ground first? I) bird feather II) tennis ball
- A) I
- B) II
- C) Both I & II
- D) Depending upon the speed of falling ball and feather
Correct Answer

A. C) Both I & II

Explanation

Both the bird feather and the tennis ball will reach the ground at the same time because they are both in a vacuumized chamber. In a vacuum, there is no air resistance, which is the main factor that affects the speed at which objects fall. Therefore, both objects will fall with the same acceleration due to gravity and reach the ground simultaneously.

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16.

Which of the following reacts as "Blistering agent"?
- A) Bio gas
- B) Phosgene
- C) Phosphine
- D) Mustard gas
Correct Answer

A. D) Mustard gas

Explanation

Mustard gas is a blistering agent because it causes severe burns and blisters on the skin. It is a chemical compound that is commonly used in chemical warfare. When it comes into contact with the skin, it causes the skin to blister, which can be extremely painful and can lead to long-term damage. Mustard gas is highly toxic and can cause serious health problems, including respiratory issues and damage to internal organs. It is important to handle and store mustard gas with extreme caution due to its dangerous nature.

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17.

Passage#1 Read this paragraph, answer this question: Q#94: Is the quality of friends important?
- A)No, it is important to have more number of friends, quality does not matter
- B) No, number of comments on social networking sites is important, not the quality of friends
- C) Yes, it matter
- D) No, quality comes automatically with quantity
Correct Answer

A. C) Yes, it matter

Explanation

The correct answer is C) Yes, it matters. The passage suggests that the quality of friends is important, implying that having good, trustworthy friends is more important than having a large quantity of friends or receiving a high number of comments on social networking sites.

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18.

Which electronic configuration corresponds to an element of Group-III A of the periodic table
- A)
- B)
- C)
- D) None of these
Correct Answer

A. A)

Explanation

The electronic configuration in option A) corresponds to an element of Group-III A of the periodic table.

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1
19.

At Murree Hill, water boils at about
- A) 100 *C
- B) 120 *C
- C) 98 *C
- D) 69 *C
Correct Answer

A. C) 98 *C

Explanation

At Murree Hill, water boils at about 98 *C. This is because the boiling point of water decreases with an increase in altitude. Murree Hill is located at a high altitude, and as a result, the atmospheric pressure is lower compared to sea level. Lower atmospheric pressure lowers the boiling point of water, causing it to boil at a lower temperature than the standard boiling point of 100 *C. Therefore, the correct answer is C) 98 *C.

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20.

A stone, thrown at an angle to the horizontal in the gravitation field, follows a parabolic path PQRST in the absence of the air resistance. These points denote the position of the stone after successive equal time intervals. T is the highest point reached. The displaced PQ, QR, RS and ST:
- Has equal vertical components
- Increase at a constant rate
- has equal horizontal component
- Decrease at a constant rate
Correct Answer

A. has equal horizontal component

Explanation

The correct answer is that the displaced PQ, QR, RS, and ST have equal horizontal components. This means that the stone covers the same horizontal distance in each interval of time. Since the stone follows a parabolic path, its vertical component changes as it moves up and then down, but the horizontal component remains the same throughout its trajectory.

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21.

Which of the following species is a nucleophile:
- A)
- B)
- C) BF3
- D)
Correct Answer

A. D)
22.

Passage#2: Read out the given passage, answer this question. Q#96: What would be the best title for this passage?
- A) The many different kinds of raisins
- B) A history of raisins
- C) The discovery of Golden Raisin
- D) Healthy snacks
Correct Answer

A. B) A history of raisins

Explanation

The passage provides information about the history of raisins, discussing their different kinds and mentioning the discovery of Golden Raisins. This suggests that the best title for the passage would be "A history of raisins".

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23.

The focus of parabola y²=8x and the equation of directrix are respectively:
- A) (-2,0) and x=-2
- B) (2,0) and x=-2
- C) (0,-2) and x=2
- D) (0,2) and x=2
Correct Answer

A. B) (2,0) and x=-2

Explanation

The focus of a parabola is a point that lies on the axis of symmetry of the parabola and is equidistant from the directrix. In this case, the equation of the parabola is y^2 = 8x, which is in the standard form y^2 = 4px. Comparing this with the given equation, we can see that p = 2. Therefore, the focus of the parabola is (p, 0) = (2, 0). The equation of the directrix is x = -p, so the directrix is x = -2. Therefore, the correct answer is B) (2,0) and x=-2.

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24.

Passage#2 Read the passage and answer this question. What question is answered in the INTRODUCTORY paragraph?
- A) How are golden raisins made?
- B) What kinds of raisins do people eat?
- C) What were raisins once used as?
- D) What happened in 1873?
Correct Answer

A. C) What were raisins once used as?

Explanation

The introductory paragraph of the passage answers the question of what raisins were once used as. This means that the passage provides information about the historical use or purpose of raisins.

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25.

On a rainy day, a child was carrying an oil poly-bag. He eventually dropped the oil bag and it fell down and oil rushed out of the bag and spread all over the watery surface. Instantly, it appeared beautiful disordered pattern of colors over this surface. The thin layer of oil on the surface of water looked colored due to:
- A) Polarization of light
- B) Interference of light
- C) Diffraction of light
- D) Dispersion of light
Correct Answer

A. B) Interference of light

Explanation

The thin layer of oil on the surface of water creates a phenomenon called interference of light. When light passes through the oil and water interface, it gets reflected at both the top and bottom surfaces of the oil layer. These reflected waves interfere with each other, causing constructive and destructive interference. This interference results in the formation of beautiful and colorful patterns on the watery surface.

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26.

Which one do you like?
- A) (1,1)
- B) (25,4)
- C) (4,25)
- D) (2,4)
Correct Answer

A. B) (25,4)

Explanation

The correct answer is B) (25,4) because it is the only option that matches the given question, "Which one do you like?" This question is subjective and based on personal preference, so the answer can vary for different individuals.

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27.

A coil is hung with ceiling of a room by the means of a thread. Suddenly, a bar magnet is introduced, then magnet with its north pole moves towards the coil. Then direction of induced current in the coil is:
- Clockwise
- Anti clockwise
- Initially it is clockwise then becomes counter-clockwise
- No current will pass through the coil
Correct Answer

A. Anti clockwise

Explanation

When a bar magnet is introduced near a coil, it creates a changing magnetic field. According to Faraday's law of electromagnetic induction, this changing magnetic field induces an electric current in the coil. The direction of the induced current can be determined using Lenz's law, which states that the induced current will flow in a direction that opposes the change in magnetic field. In this case, as the north pole of the magnet moves towards the coil, the induced current will flow in the opposite direction to the motion of the magnet, which is anti-clockwise.

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1
28.

In amplitude modulation, the amplitude of carrier wave changes in proportional to the:
- A) the frequency of modulating signal
- B) amplitude of modulating signal
- C) sign of the modulating signal
- D) All of the above
Correct Answer

A. B) amplitude of modulating signal

Explanation

In amplitude modulation, the amplitude of the carrier wave changes in proportion to the amplitude of the modulating signal. This means that as the amplitude of the modulating signal increases or decreases, the amplitude of the carrier wave will also increase or decrease accordingly. The frequency of the modulating signal and the sign of the modulating signal do not directly affect the amplitude of the carrier wave in amplitude modulation. Therefore, the correct answer is B) amplitude of modulating signal.

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29.

During the process of crystallization, the hot saturated solution:
- A) is cooled very slowly to get the large sized crystals
- B) is cooled at moderate rate to get medium sized crystals
- C) is evaporated to get the crystals of the product
- D) is mixed with an immiscible liquid to get the pure crystals of the product
Correct Answer

A. B) is cooled at moderate rate to get medium sized crystals

Explanation

During the process of crystallization, the hot saturated solution is cooled at a moderate rate to get medium-sized crystals. Cooling the solution slowly allows the molecules to come together in an orderly manner, resulting in larger crystals. However, cooling the solution too quickly can lead to the formation of small crystals or even an amorphous solid. Therefore, cooling the solution at a moderate rate strikes a balance and allows for the formation of medium-sized crystals.

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30.

The vulgar fraction of 1.24242424…… is:
- 122/990
- 123/990
- 123/99
- 122/99
Correct Answer

A. 123/99

Explanation

The given decimal number, 1.24242424..., can be expressed as a repeating decimal. To convert it into a vulgar fraction, we can set it as x = 1.24242424... and subtracting x from 100x gives 99x = 123. Thus, x = 123/99, which is the correct answer.

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31.

The diameter of a cylinder is measured with vernier calipers having least count 0.01 cm. The diameter is 1.95 cm. The radius to the correct significant figures will be:
- A) 0.975 cm
- B) 0.98 cm
- C) 1.0 cm
- D) 1 cm
Correct Answer

A. B) 0.98 cm

Explanation

The diameter of the cylinder is measured to be 1.95 cm. Since the least count of the vernier calipers is 0.01 cm, the measurement is accurate up to two decimal places. To find the radius, we divide the diameter by 2. Therefore, the radius will be 0.975 cm. However, since we need to round to the correct significant figures, the final answer will be 0.98 cm, rounded to two decimal places.

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32.

Pickle when placed in the path of current
- A) will conduct the current
- B) will not conduct the current
- C) will become unfit to eat
- D) None of the above
Correct Answer

A. A) will conduct the current

Explanation

When a pickle is placed in the path of current, it will conduct the current. This means that electricity will be able to pass through the pickle, making it a conductor of electricity.

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33.

Passage#2 Read the passage and answer this given question. Golden raisin were discovered
- A) after dark raisins
- B) the passage doesn't say
- C) before dark raisins
- D) at the same time as dark raisins
Correct Answer

A. A) after dark raisins

Explanation

The passage states that "Golden raisins were discovered." This implies that the discovery of golden raisins happened after the discovery of dark raisins. Therefore, the correct answer is A) after dark raisins.

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34.

If sinA=cosB in any triangle ABC, then
- A) A+B= 90 °
- B) A+B= 180°
- C) A+B= 360°
- D) A=B
Correct Answer

A. A) A+B= 90 °

Explanation

If sinA=cosB in any triangle ABC, it means that the sine of angle A is equal to the cosine of angle B. In a right triangle, the sine of one acute angle is equal to the cosine of the other acute angle. Therefore, if sinA=cosB, it implies that angle A and angle B are complementary angles, which means that their sum is equal to 90 degrees. Hence, the correct answer is A) A+B= 90 °.

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35.

The derivative of sin²x w.r.t cos²x is:
- A) -tanx
- B) tan²x
- C) tanx
- D) None of these
Correct Answer

A. D) None of these
36.

Click the best option
- 75
- 78
- 33
- 34
Correct Answer

A. 75
37.

Click the best option
- A)
- B)
- C)
- D)
Correct Answer

A. D)
38.

Click the best option
- A) -1
- B) 3
- C) -3
- D) 2
Correct Answer

A. B) 3

Explanation

Among the given options, option B) 3 is the best choice because it is the only positive number. The other options, A) -1, C) -3, and D) 2, are all negative or non-positive numbers. Therefore, option B) 3 is the correct answer.

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2
39.

Passage#2 Read the passage and answer this given question. Q#100: Which of the following question is NOT answered in the passage?
- A) When did farmers start growing raisins in America?
- B) Why did American farmers start producing raisins?
- C) How are golden raisins produced?
- D) Why are raisins healthy for you?
Correct Answer

A. D) Why are raisins healthy for you?

Explanation

The passage does not provide any information about the health benefits of raisins. It only mentions the history of raisin production in America and the process of producing golden raisins. Therefore, the question "Why are raisins healthy for you?" is not answered in the passage.

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40.

Click the best option
- -1
- 1/3
- -1/3
- -3/2
Correct Answer

A. 1/3

Explanation

The correct answer is 1/3 because it is the only option that is a positive fraction. The other options are negative or improper fractions.

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41.

If log₁₀(x-15)= log₁₀10=4 then value of x is:
- 785
- 1085
- 1015
- 985
Correct Answer

A. 1015

Explanation

The equation log10(x-15) = log1010 = 4 implies that the logarithm of (x-15) to the base 10 is equal to 4. Since log1010 is equal to 1, we can rewrite the equation as log10(x-15) = 1. This means that (x-15) is equal to 10^1, which is 10. Therefore, x = 10 + 15 = 25. However, none of the given answer choices is 25. Therefore, the correct answer is not available.

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42.

English Reading Comprehension: Passage#1 Read out the passage as given below, and Answer accordingly: Q#91:Name one change effected in the present situation which hassled to a re-thinking of the concept of friendship
- A) Bacon and Thoreau’s theories are no longer available to read
- B) The arrival of social media on the scene
- C) There is more interest in the sciences
- D) Friendships are not possible in the real world anymore, due to over-competition
Correct Answer

A. B) The arrival of social media on the scene

Explanation

The correct answer is B) The arrival of social media on the scene. This suggests that the introduction of social media has caused a re-thinking of the concept of friendship. Social media has changed the way people connect and interact with each other, leading to new forms of friendships and relationships. It has also raised questions about the authenticity and depth of these friendships, as well as the impact of virtual connections on real-life relationships.

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43.

The value of m for which equation (1+m)x²-2(1+3m)x+(1+8m)=0 has equal roots is:
- 0
- 3
- 1
- Both A & B
Correct Answer

A. Both A & B

Explanation

To find the value of m for which the equation has equal roots, we can use the discriminant. The discriminant of a quadratic equation ax^2+bx+c=0 is given by b^2-4ac. If the discriminant is equal to zero, the equation will have equal roots. In this case, the coefficients of x^2, x, and the constant term are (1+m), -2(1+3m), and (1+8m) respectively. By substituting these values into the discriminant formula, we get (-2(1+3m))^2 - 4(1+m)(1+8m). Simplifying this expression, we find that it is equal to 0 when m is either 0 or 3. Therefore, the correct answer is Both A & B.

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44.

Click the best option
- 1
- 2
- 3
- 0
Correct Answer

A. 3
45.

If (3x^a)^b= 81x¹² then a+b=
- 4
- 5
- 6
- 7
Correct Answer

A. 7

Explanation

If (3xa)b = 81x12, it means that the product of 3xa and b is equal to the product of 81 and 12. We can simplify this equation to 3ab = 972. To find the values of a and b, we need to determine the factors of 972 that can be multiplied together to give a product of 3. The factors of 972 are 1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, 81, 108, 162, 243, 324, 486, and 972. From these factors, we can see that a = 3 and b = 4. Therefore, a + b = 3 + 4 = 7.

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46.

A particle is moving in a straight line with velocity v=4-t² whereas t is time from a fixed point , then acceleration after 4 second is:
- A) -8 m/s²
- B) 8 m/s²
- C) 4 m/s²
- D) -4 m/s²
Correct Answer

A. A) -8 m/s²

Explanation

The given equation for velocity v=4-t^2 represents a particle's velocity as a function of time. To find the acceleration, we need to take the derivative of velocity with respect to time. Differentiating v=4-t^2 with respect to t, we get dv/dt = -2t. Plugging in t=4 seconds, we get dv/dt = -2(4) = -8 m/s^2. Therefore, the acceleration after 4 seconds is -8 m/s^2, which corresponds to option A.

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47.

The order of decreasing power of F,Cl,Br and I as an oxidizing agent is:
- A) F2 > Cl2 > Br2 > I2
- B) Cl2 > F2 > Br2 > I2
- C) I2 >Br2 >Cl2 >F2
- D) B2 > I2 > Cl2 >F2
Correct Answer

A. A) F2 > Cl2 > Br2 > I2

Explanation

This answer is correct because fluorine (F2) is the most powerful oxidizing agent among the given options. It has the highest electronegativity and is able to gain electrons easily, making it a strong oxidizing agent. Chlorine (Cl2) is less powerful than fluorine but still more powerful than bromine (Br2) and iodine (I2). Therefore, the correct order of decreasing power as an oxidizing agent is F2 > Cl2 > Br2 > I2.

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48.

Passage#1: Read this passage and answer the given question Q#95: As per the first, paragraph what are the debates about?
- A) They are centered around whether our Facebook friends are helping us become more or less happy
- B) There are no debates around friendship
- C) The quality of comments of social media is debatable
- D) Thoreau and Aristotle’s thinking is at loggerheads
Correct Answer

A. A) They are centered around whether our Facebook friends are helping us become more or less happy

Explanation

The passage states that the debates are centered around whether our Facebook friends are helping us become more or less happy. This suggests that there is ongoing discussion and disagreement about the impact of Facebook friendships on our happiness.

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49.

A girl stands on the weighing scale placed in a stationary elevator.The scale reads 30 kg. The elevator is then activated to move from ground floor to 10th floor. As the lift moves from its stationary position on the ground floor until it comes to rest on 10th floor. The scale reading during this passage :
- A) remains constant
- B) first increases, then remains constant for some particular time and then again tends to increase
- C) first increases, then remains constant for some particular time and then again tends to decrease
- D) first decreases, then remains constant for some particular time and then again tends to increase
Correct Answer

A. C) first increases, then remains constant for some particular time and then again tends to decrease

Explanation

As the elevator moves upwards, the girl experiences an increase in apparent weight due to the upward acceleration. This causes the scale reading to increase. Once the elevator reaches a constant velocity, the girl experiences a constant apparent weight and the scale reading remains constant. Finally, as the elevator decelerates to come to a stop on the 10th floor, the girl experiences a decrease in apparent weight, causing the scale reading to decrease. Therefore, the correct answer is C) first increases, then remains constant for some particular time and then again tends to decrease.

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