Physics Past Questions and Answers

When an object is placed at the centre of curvature of a concave mirror, its image is formed at

A The focus
B Infinity
C The centre of curvature
D A distance twice the radius of curvature

Question 1177:

A rectangular glass prism of thickness d and absolute refractive index n is placed on a point object which is viewed vertically downward from above the prism. Which of the following expressions correctly defines the apparent upward displacement of the object?

A \(\frac{d}{n}\)
B Dn
C \(\frac{d}{n - 2}\)
D \(\frac{d(n - 1)}{n}\)

Question 1178:

Which of the following factors can affect the speed of sound in air? i. The temperature of the surrounding ii. The direction of the wind iii. The pitch of the sound.

A I and ii only
B Ii and iii only
C I and iii only
D I, ii and iii

Question 1179:

A sounding tuning fork is brought near the open end of a pipe containing air and the loudness of the sound is observed to increase. This observation is due to

A An echo
B Resonance
C Interference
D Reverbration

Question 1180:

Which of the following statements about sound wave is not correct? Sound waves can be

A Reflected
B Refracted
C Diffracted
D Polarized