Physics Past Questions and Answers

The distance between the successive crests of a wave travelling at 20ms^-1 is 25cm. Calculate the frequency of the wave

A 0.8Hz
B 5.0Hz
C 50.0Hz
D 80.0hz

Question 1112:

A ray from a fixed object is incident on a plane mirror at an angle of 20^o. If the mirror is rotated through 30^o by how many degree would the reflected ray rotate?

A 60^o
B 50^o
C 40^o
D 30^o

Question 1113:

Which of the following distances is usually adjustable in the camera? The distance between the

A Lens and the film
B Diaphragm and the shutter
C Shutter and the film
D Diaphragm and the film

Question 1114:

A travelling microscope is focused on a mark on a table. If a glass block of thickness 18.0cm is placed on the mark by how many centimeters will the microscope be moved upwards so as to focus the mark once again? [refractive index of glass = 1.5]

A 27cm
B 24cm
C 9cm
D 6cm

Question 1115:

In which of the following media would sound wave travel fastest?

A Wood
B Water
C Iron
D Mercury