1.
A cube has __________surfaces
Correct Answer
B. 6
Explanation
A cube has 6 surfaces because it is a three-dimensional shape with 6 equal square faces. Each face of the cube is a surface, resulting in a total of 6 surfaces.
2.
A cuboid has ______________ edge
Correct Answer
C. 12
Explanation
A cuboid has 12 edges. Each edge is formed by the intersection of two adjacent faces of the cuboid. Since a cuboid has 6 faces, there are 3 pairs of adjacent faces, resulting in 3 pairs of edges. Therefore, a cuboid has 12 edges in total.
3.
A cylinder has ______________ vertex
Correct Answer
A. 0
Explanation
A cylinder does not have any vertex. A vertex is a point where two or more edges of a solid meet. In the case of a cylinder, it has two circular bases and a curved surface connecting the bases. There are no points where edges meet, hence it does not have any vertex.
4.
A sphere has ___________ curved surface
Correct Answer
B. 1
Explanation
A sphere has one curved surface because it is a three-dimensional object that is perfectly symmetrical in all directions. The surface of a sphere is continuous and smooth, with no edges or corners. It is made up of an infinite number of points equidistant from the center, forming a single curved surface. Therefore, the correct answer is 1.
5.
A cone has ______________ edge
Correct Answer
B. 1
Explanation
A cone has one edge because it is a three-dimensional shape that is formed by a curved surface that connects a circular base to a single point called the apex. The edge of a cone refers to the line where the curved surface and the base meet, and since there is only one curved surface and one base, there is only one edge in a cone.
6.
A cuboid has ______ plan surface
Correct Answer
B. 6
Explanation
A cuboid has six planar surfaces. This means that it has six flat faces that are all rectangles. Each face is connected to another face by edges, and each face meets at a corner called a vertex. The six surfaces of a cuboid include a top face, a bottom face, and four side faces. Therefore, the correct answer is 6.
7.
The smallest one-digit number is
Correct Answer
B. 1
Explanation
The smallest one-digit number is 1 because it is the lowest possible value for a single digit. Numbers like 0 and 9 are also one-digit numbers, but 1 is the smallest among them.
8.
The largest one-digit number is
Correct Answer
C. 9
Explanation
The largest one-digit number is 9 because it is the highest single digit and there are no higher digits in the number system.
9.
Add 1 to the greatest 3 digit number
Correct Answer
D. 1000
Explanation
The greatest 3 digit number is 999. Adding 1 to it gives us 1000, which is the next number after 999 in the sequence of numbers.
10.
The predecessor of 3459 is
Correct Answer
C. 3458
Explanation
The predecessor of a number is the number that comes before it. In this case, the number before 3459 is 3458.
11.
The successor of 3485 is
Correct Answer
A. 3486
Explanation
The successor of a number is the number that comes immediately after it in a sequence. In this case, the given number is 3485. To find its successor, we simply add 1 to it, resulting in 3486. Therefore, the correct answer is 3486.
12.
A line having how many endpoint ______________
Correct Answer
C. 0
Explanation
A line does not have any endpoints. A line extends infinitely in both directions and does not have any distinct starting or ending points. Therefore, the correct answer is 0.
13.
A line sigment has ______________ number of end point
Correct Answer
B. 2
Explanation
A line segment is a part of a line that has two distinct endpoints. Therefore, a line segment has two end points.
14.
Ray has only _________________ end point
Correct Answer
A. 1
Explanation
Ray has only one endpoint because a ray is a line that starts at a point and extends infinitely in one direction. It does not have a second endpoint like a line segment.
15.
8888 write the next number
Correct Answer
C. 8889
Explanation
The next number in the sequence is 8889. This is because the sequence is decreasing by 1 each time, so the next number will be 1 less than the current number.