Physics MCQS

1001. A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to
A. 500 mm
B. 5 x 10-3 mm
C. 2 x 10-5 mm
D. 2 x 10-3 mm

1002. In plane-polarized light
A. Vibration in all directions
B. Vibration in two mutually perpendicular directions
C. Vibration takes place in a direction perpendicular to the direction of propagation of light
D. No vibration at all

1003. Light on passing through a Polaroid is
A. Plane-polarized
B. Unpolarized
C. Circularly polarized
D. Elliptically polarized

1004. Capacity of a body to do work is?
A. Energy
B. Force
C. Momentum
D. Power

1005. Kinetic energy can be defined as the dot product of?
A. Force and velocity
B. Momentum and force
C. Average momentum and velocity
D. None of the above

1006. Watt m-2 is the unit of?
A. Work
B. Power
C. Energy
D. Intensity

1007. Work done in a gravitational field is?
A. Zero
B. Virtual
C. Minimum
D. Negative

1008. Work done in the Earth gravitational field is?
A. Dependent on the path followed
B. Independent of the path followed
C. Either of them
D. None of the above

1009. The space around the Earth in which gravitational force acts on a body is called?
A. Magnetic field
B. Electric field
C. Gravitational field
D. Electromagnetic field

1010. In a gravitational field, if the displacement is against the gravitational force, the work done will be?
A. Zero
B. Positive
C. Negative
D. None of the above