381. The energy of a quantum state primarily depends upon the quantum number?
A) n
(B) m
(C) s
(D) l
382. A hydrogen atom is in its ground state when its orbital electron?
(A) Is within the nucleus
(B) Escapes from it
C) Is in its lowest energy level
(D) Is stationary
383. The total energy of an atomic electron is?
(A) Zero
B) Less than zero
(C) More than zero
(D) All of the above
384. A net force accelerates a mass with acceleration ‘a’. If the same force is applied to m/2, then the acceleration will be:
A. 4a
B. 2a
C. a/2
D. a/4
385. A projectile has a maximum range of 20m when projected with velocity ‘v’. If it is projected at an angle of 15 degrees with the same velocity, then its range is:
A. 20m
B. 15m
C. 10m
D. 5m
386. The speed of a car at different intervals is given by 20 m/s for 2.0 sec, 40 m/s for 2.0 sec, and 60 m/s for 6.0 sec. The average speed of a car is:
A. 12m/s
B. 13.3m/s
C. 40m/s
D. 48m/s
387. A wooden block of mass 1.0 kg is on a rough horizontal surface. A force of 12N is applied to the block horizontally, and it accelerates at 4.0 m/s². The magnitude of the frictional force is:
A. 4N
B. 2N
C. 6N
D. 8N
388. Two equal masses travel toward each other with speeds of 60 cm/s and 40 cm/s. They stick together on impact. What is the speed of the masses after impact?
A. 10 cm/s
B. 20 cm/s
C. 30 cm/s
D. 40 cm/s
389. Kinematics is the branch of mechanics which deals with:
A. Rest
B. Rest and Motion
C. Motion and Cause
D. Motion without cause
390. The average and instantaneous velocities of a body will be the same if the body moves with:
A. Average velocity
B. Constant velocity
C. Constant acceleration
D. None of these
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