Two blocks P and Q of different metals having their masses in the ratio 3 : 2 are given the same amount of heat. Their temperature rise by the same amount. The ratio of their specific heat capacities is :

1. √3 : √2
2. 9 : 4
3. 2 : 3
4. 3 : 2

The temperature of a substance on heating rises because :

1. average potential energy of molecules increases
2. average kinetic energy of molecules increases
3. average kinetic energy of molecules decreases
4. average potential energy of molecules remains the same

An endoscope uses optical fiber to transmit high resolution images of internal organs without loss of information. The phenomenon of light that governs the functioning of the optical fiber is:

1. refraction
2. reflection
3. scattering
4. total internal reflection

Complete the following by choosing the correct answer from the bracket:

(a) Bottle opener is an example of …………… [class I/class II/class III] lever.

(b) If there are n movable pulley with one fixed pulley, the mechanical advantage is given by …………… $[2^n/2^{n+1}/2^{n-1}]$

(c) According to work energy theorem, the increase in the kinetic energy of a moving body is equal to …………… by a force acting in the direction of moving body [velocity/acceleration/work done].

(d) If a machine does a given amount of work in less time, …………… power is spent by it. [less/more/same]

(e) If the length l of wire is increased to 3l by stretching its resistance R increases to …………… [3R/6R/9R]

(f) If a coil is viewed from one end, and the current flows in clockwise direction, then the end is a ………….. pole. [north/south]