Work done by variable force is determine by dividing____________________?
(A) force into small interval
(B) displacement into small interval
(C) both force and displacement into small intervals
(D) force into small and displacement into large intervals
Proton electron neutron and a particles have same momentum. Which of them have highest K.E ?
(A) Proton
(B) electron
(C) neutron
(D) a-particle
The average power and instantaneous power become equal if work is done at __________________?
(A) any rate
(B) at variable rate
(C) at uniform rate
(D) at high rate
If a body a mass of 2 kg is raised vertically through 2m, then the work done will be _________________?
(A) 38.2 J
(B) 392.1 J
(C) 39.2 J
(D) 3.92 J
When a force is parallel to the direction of motion of the body, then work done on the body is_____________________?
(A) zero
(B) minimum
(C) infinity
(D) maximum
Which experiment shows that wavelength of light is smaller than that of sound___________________?
(A) Diffraction
(B) Polarization
(C) Interference
(D) Reflection
Gives the definition of metre in terms of wavelength of red cadmium light ___________________?
(A) Newton
(B) Einstein
(C) Michelson
(D) Galileo
A thing that emits its own light is___________________?
(A) luminous
(B) non-luminous
(C) incandescent
(D) bright
Diffraction fringes are____________________?
(A) equally spaced
(B) distance between them increases
(C) distance between then decreases
(D) they are adjacent with no space in between
Light on passing through a Polaroid is ___________________?
(A) plane polarized
(B) un-polarized
(C) circularly polarized
(D) elliptically polarized