Physics Past Questions and Answers

If the stress on a wire is 10⁷NM^-2 and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The young's modulus of the wire is

A 5 . 0 x 104 Nm-2
B 5 . 0 x 105 Nm-2
C 2 . 0 x 108 Nm-2
D 2 . 0 x 109 Nm-2

Question 1632:

A solid weigh 10 .00 N in air, 6 N when fully immersed in water and 7 . 0 N when fully immersed in a liquid X. Calculate the relative density of the liquid, X.

A 5/3
B 4/3
C 3/4
D 7/10

Question 1633:

When temperature of a liquid increases, its surface tension

A Decreases
B Increases
C Remain Constant
D Increases then decreases

Question 1634:

A gas at a volume of V₀ in a container at pressure P₀ is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant?

A P0/5
B 4P0/5
C P0
D 5P0

Question 1635:

A piece of substance of specific head capacity 450JKg^-1K^-1 falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms^-2]

A 2/9Â°C
B 4/9°C
C 9/4Â°C
D 9/2Â°C