An electric heater is rated 1500 watt. If electric power costs Rs 2 per kilo-watt-hour, then the cost of power for 10 hours running of the heater is

Suppose we have an iron nail and an iron ball of same mass. When submerged in water, the iron ball may float but the nail always sinks. This is because

 
The plot given above represents the velocity of a particle (in m/s) with time (in seconds). Assuming that the plot represents a semi-circle distance traversed by the particle at the end of 7 seconds is approximately

What should be the reading of the voltmeter in the circuit given above? (All the resistances are are equal to 1 Ω and the battery is of 1.5 volt)

 A bullet of mass 20 gm is fired in the horizontal direction with a velocity 150 m from a pistol of mass 1 kg. Recoil velocity of the pistol is

 
The plot given above represents displacement ‘x’ of a particle with time ‘t’. The particle is