Physics Past Questions and Answers

Totally reflecting prisms are preferred to mirrors in periscopes because

I. mirror givegive multiple images
II. silvering on mirrors is easy damaged
III. mirrors reflect less light than totally reflecting prisms

A I only
B I and II only
C I and III only
D II and III only
E I,II and III

Question 62:

What is the energy stored in a 10μ F capacitor if the potential difference between the plates is 40 V?

A 2.0 × 10^-4J
B 8.0 ×10^-4J
C 4.0 × 10^-3J
D 8.0 × 10^-3J
E 1.6 × 10^-2J

Question 63:

Notes of the same frequency sounded on a piano and on a flute may differ in

I. pitch
II. quality
III. Loudness

A I only
B II only
C I and III only
D II and III only
E I, II and III

Question 64:

What is X in the equation given below? 42He + 94Be → 126C + X

A Electron
B Hydrogen
C Lithium
D Neutron
E Proton

Question 65:

A waterfall is 630m high. What is the change in temperature of a quantity of water that falls from the top to the bottom of the waterfall? (Neglect heat losses to the surroundings, take g as 10 ms-2 and specific heat capacity of weather as 4200,J kg-1K-1

A 0.15°C
B 1.50°C
C 15.00°C
D 21.00 °C
E 50.00°C