An elastic material of length 3m is to be stretched to reduce an extension three times its original length. Calculate the force required to produce the extension

The amount of heat given out or absorbed when a substance changes its state at a constant temperature is known as

• A. latent heat
• B. heat capacity
• C. specific latent heat
• D. specific heat capacity

An aluminium cable of diameter 4 x 10^-3m and resistivity 3.0 x 10^-8\(\omega\)m has a resistance of 21\(\Omega\). Calculate the length of the cable. (\(\pi = 3.14\))

• A. 8.0 x 10²m
• B. 8.8 x 10³m
• C. 8.0 x 10⁴m
• D. 8.8 x 10⁴m

Which of the following physical qualities affects the saturated vapour pressure of a liquid ?

• A. temperature
• B. volume
• C. mass
• D. density

In a nuclear fusion process, four protons each of mass Mp were fused to produce a nucleus X of mass Mx. Which of the following equations is CORRECT?

• A. 4M_p > M_x
• B. 4M_p = M_x
• C. 4M_p< M_x
• D. M_p > M_x

Which of these is a derived unit?

• A. Kilogram
• B. Metre
• C. Newton
• D. Second

Primary colours of light are

• A. Red, blue and green
• B. Cyan, magneta and yellow
• C. Black, blue and green
• D. None of these colours

The following properties of a solid are measured on earth i. weight ii. specific heat capacity iii. density. Which of the properties will hav a different value if measured in space?

• A. i only
• B. ii only
• C. iii only
• D. ii and iii only

(a) Name two artificial satellites.

(b) A geostationary satellite moves in an orbit of radius 6300 km. Calculate the speed with which it moves in the orbit. π = \(_{22}{7}\)

A body weighing 80N stands in an elevator that is about to move. The force exerted by floor on the body as the elevator moves upward with an acceleration of 5 ms-2 is [g = 10ms-2]

• A. 40 N
• B. 80 N
• C. 120 N
• D. 160 N