Physics Past Questions and Answers

When a girl moves towards a plane mirror at a speed of 4.0m/s, the distance between the girl & her image reduces a speed of

A 2 m/s
B 4 m/s
C 8 m/s
D 12 m/s

Question 2142:

One newton à— One meter equals?

A One water
B One Joule
C One ampere
D One kilogram

Question 2143:

A microscope is focused on a mark on a table, when the mark is covered by a plate of glass 2m thick, the microscope has to be raised 0.67cm for the mark to be once more in focus. Calculate the refractive index.

A 1.52
B 1.68
C 2.58
D 1.82

Question 2144:

Radio waves belongs to the class of ware whose velocity is about

A 340m/s
B 3 × 10\(^{6}\) m/s
C 3 à— 10\(^{8}\) m/s
D 3 à— 10\(^{-8}\) m/s

Question 2145:

A single force which produces the same effect as a set of forces acting together at a point is known as the

A Component
B Equilibrant
C Resultant
D Resistant