Name that branch of science which deals with the study of stars.

3

(a)

A jeweller put a diamond weighing 5.42 g in a box weighing 1.2 Kg. Find the total weight of the box and the diamond to correct number of significant figures.

3

(a)

The farthest objects in our universe discovered by modern astronomers are so distant that light emitted by them takes billions of years to reach the earth.These objects(known as quasars) have many puzzling features which have not yet been satisfactorily explained. What is the distance in km of a quasar from which light takes 3.0 billion years to reach us?

3

(a)

What are uses of a velocity  - time graph ?

3

(a)

If two bodies have circular path of radius r₁ and r₂ and the time taken are the same, find the ratio of the angular speed.

3

(a)

A monkey of mass 40 kg climbs on a rope which can stand a maximum tension of 600 N. In which of the following cases will the rope break: the monkey climbs up with a uniform speed of 5 ms^-1
(Ignore the mass of the rope).

3

(a)

What is the gravitational potential energy of a body at height h from the earth surface?

3

(a)

If the required pressure in the tyre of a car is 199 kPa, then what is the absolute pressure?

3

(a)

What is the effect:
(a) of highly soluble impurities on the surface tension of a liquid?
(b) of less soluble impurities on the surface tension of a liquid?
(c) on the angle of contact when the temperature of a liquid is increased?

3

(a)

On a hot day, a car is left in sunlight with all the windows closed. After some time, it is found that the inside of the car is considerably warmer than the air outside. Explain, why?

3

(a)

What is the kinetic energy per molecule of a gas whose pressure is P?

3

(a)

Which of the following relationships between the acceleration a and the displacement x of a particle involve simple harmonic motion?
a = -10x

3

(a)

Define the terms 'node' and 'antinode'?

3

(a)