Two sound waves X and Y have the same amplitude and the same wave pattern but their frequencies are 60 Hz and 120 Hz respectively, then

1. X will be shriller and Y will be grave
2. X will be grave and Y will be shriller
3. X will differ in quality than Y
4. X is louder than Y

The graph of voltage vs current for four different materials is shown below.

Which of these four materials would be used for making filament of a bulb?

1. Q
2. S
3. P
4. R

Current is flowing through a coil as shown in the figure. Which one of the given figures will correctly depict the magnetic polarity and the direction of the lines of force along the axis of the coil.

1.

2.

3.

4.

Heat capacity of a body is the :

1. energy needed to melt a body without change in its temperature
2. energy needed to raise the temperature of a body by 1°C
3. increase in volume of the body when its temperature increases by 1°C
4. total amount of internal energy that is constant