671. Wheatstone bridge is?
A. Electrical device
B. Instrument
C. Circuit
D. None of the above
672. A hollow metal sphere is charged to potential V. The potential at its center is:
A. V
B. V/2
C. -V
D. 2V
673. A constant current is sent through a helical coil. The coil:
A. Produces zero magnetic field at its center
B. Tends to rotate about its axis
C. Tends to get shorter
D. Tends to get longer
674. An object moving in a circle at constant speed:
A. Must have only one force acting on it
B. Has an acceleration of constant magnitude
C. Is held to its path by centrifugal force
D. None of the above
675. A feather and a lead ball are dropped from rest in a vacuum on the moon. The acceleration of the feather is:
A. Less than that of the lead ball
B. The same as that of the lead ball
C. More than that of the lead ball
D. None of the above
676. Light from some stars shows an apparent change in frequency because of:
A. Relative motion
B. Reflection
C. Diffraction
D. Interference
677. Torque acting on a body determines:
A. Acceleration
B. Linear acceleration
C. Angular acceleration
D. Direction of motion of the body
678. Which one is not a type of dynamic equilibrium?
A. Rotational equilibrium
B. Translational equilibrium
C. Static equilibrium
D. The responses A and C are both correct.
679. Three coplanar powers following up on a body keep it in harmony. It would be ideal for they to consequently be:
A. Concurrent
B. Non-concurrent
C. Parallel
D. Non-Parallel
680. A central force is that which:
A. Can produce torque
B. Cannot produce torque
C. Sometime can produce torque, sometimes cannot
D. Has no relation with torque
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