Physics Past Questions and Answers

The terrestrial telescope has one extra lens more than the astronomical telescope. The extra lens is for

A Improving the sharpness
B Creating an inverted image
C Magnification of the image
D Erection of the image

Question 12:

The driving mirror of a car has a radius of curvature of 1m. A vehicle behind the car is 4m from the mirror. Find the image distance behind the mirror.

A 8/7
B 4/9
C 9/2
D 4/7

Question 13:

The pressure of a given mass of a gas changes from 200Nm^-2 to 120Nm^-2 while the temperature drops from 127°C to -73°C. The ratio of the final volume to the initial volume is

A 2 : 5
B 5 : 4
C 5 : 2
D 4 : 5

Question 14:

The thermometric substance of an absolute thermometer is

A Alcohol
B Mercury
C Helium
D Platinum

Question 15:

A plane sound wave of frequency 85.5Hz and velocity 342ms^-1 is reflected from a vertical wall. At what distance from the wall does the wave have antinode?

A 2m
B 4m
C 1m
D 3m