Physics – Class 11 Mock Test 6

10%

Question 1 of 10

1. A black hole is called so because it is a hypothetical object.

False

True

Question 1 of 10

Question 2 of 10

2. A ring, disc and solid sphere are left from the top of an incline which has sufficient friction for pure rolling. Which will reach the bottom first, if they all have the same mass ‘M’ & radius ‘R’?

Disc

Solid sphere

All will reach together

Ring

Question 2 of 10

Question 3 of 10

3. What will be the value of acceleration due to gravity on the surface of the earth if the radius of the earth suddenly decreases to 60% of its present value, keeping the mass of the earth unchanged?

5.89 m/s²

16.35 m/s²

27.25 m/s²

9.81 m/s²

Question 3 of 10

Question 4 of 10

4. The net acceleration due to gravity is zero at all points inside a uniform spherical shell.

False

True

Question 4 of 10

Question 5 of 10

5. The satellites orbiting the earth, eventually fall to the earth when they are left unsupervised or unattended because _____

the laws of gravitation predict such a trajectory

of viscous forces causing the speed of the satellite and hence height to gradually decrease

of collisions with other satellites

their power supply runs out

Question 5 of 10

Question 6 of 10

6. What is the displacement of the centre of the wheel in one rotation? Let the radius of the wheel be R.

πR

2πR

Question 6 of 10

Question 7 of 10

7. The force of gravity is a conservative force.

True

False

Question 7 of 10

Question 8 of 10

8. The earth is able to retain its atmosphere because of _____

the gravitational effect of the moon

the mean velocities of atmospheric gas molecules which is greater than that of the earth’s escape velocity

the earth’s magnetic field

the mean velocities of atmospheric gas molecules which is less than that of the earth’s escape velocity

Question 8 of 10

Question 9 of 10

9. The time period of a simple pendulum on the surface of the earth is “T”. What will be the time period of the same pendulum at a height of 2 times the radius of the earth?

Question 9 of 10

Question 10 of 10

10. The radius of the moon is approximately 3.7 times smaller than the radius of the earth. Assuming that their densities are same, what is the escape velocity of the moon compared to earth?

0.7 times

7 times

3.7 times

0.07 times

Question 10 of 10