Switch off the light in your room at night for some time and then turn it on again :
Could you see the objects in the room clearly when the light was switched off ?

Switch off the light in your room at night for some time and then turn it on again : What did you feel when it was turned on again ?

Solve the following problems. We observed the traffic lights at three different squares on the same big road. They turn green every 60 seconds, 120 seconds and 24 seconds. When the signals are switched on at 8 o’clock in the morning, all lights were green. How long after that will all three signals turn green simultaneously again?

A ceilling fan rotates about its own axis with some angular velocity. When the fan is switched off, the angular velocity becomes (1/4)^(th) of the original in time 't' and 'n' revolutions are made in that time. The number of revolutions made by the fan during the time interval between switch off and rest are (Angular retardation is uniform)

Questions based on paragraph : Study the following incident : Swara and yash were looking in a water filled vessel . They could see their images clearly in the still water . At that instant , yash threw a stone in the water . Now their images were blurred . swara could not understand the reason for the blurring of the images . : explain the reason for blurring of the images to swara by answering the following questions : Which types of reflection of light can you notice from this ?

A liquid of mass 250 is kept warm in a vessel using an electric heater. The liquid is maintained at 57^@C when the power supplied by the heater is 30 W and surrounding temperature is 27^@C . As the heater is switched off, it took 10 s time for the temperature of the liquid to fall from 47^@C to 46.9^@C . The specific heal capacity of the liquid is

An air cored solenoid with length 30 cm, area of cross section 25 cm^2 and number of turns 500, carries a current of 2.5A. The current is suddenly switched off in a brief time of 10^-3s. How much is the average back emf induced across the ends of the open switch in the circuit? Ignore the variation in magnetic field near the ends of the solenoid.

Right or wrong . If wrong , write the correct sentence : When an electrical rotating fan is switched off it continues to rotate for some time due to inertia of motion .