Physics Past Questions and Answers

How much heat is required to convert 20 g of ice at 0^oC to water at the same temperature? (Specific latent heat of ice = 336 J g^-1)

A 1.35 x 10³J
B 5.38 x 10³J
C 6.72 x 10³J
D 7.06 x 10³J
E 8.06 x 10³J

Question 432:

When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that in Q. lf the masses of P and Q are the same, calculate the ratio of the specific heat capacities of Q to P.

A 4 : 1
B 2 : 1
C 1 : 1
D 1 : 2
E 1 : 4.

Question 433:

A ray of light is incident on mirror m1 and after reflection is incident on mirror m₂ as shown in the diagram, calculate the angle of reflection of the ray at mirror m₂

A 120^o
B 90^o
C 60^o
D 45^o
E 30^o

Question 434:

A ray of light is incident on a body x as shown in the diagram above. What is the refractive index of the body?

A 1.63
B 1.50
C 1.49
D 1.33
E 1.02

Question 435:

Light travels in straight lines. In which of the following is this principle manifested? I. Pinhole camera II Formation of shadows III. Diffraction of light IV. Occurrence of eclipse

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