An object 15cm high is 30cm from pin-hole camera. If the height of the image formed at the back of the camera is 10cm, the image distance is

An electric iron is rated at 1000watts, 250v. The corresponding maximum resistance and accompanying current is

The tyre pressure of a car was found to be 150cmHg in the morning at a temperature of 27°C. Hard driving in the afternoon raised the temperature of the tyres...

The echo of a sounder from the bottom of an ocean is heard 2.5 seconds later. If the speed of sound in water is 1,400ms-1, the depth of the ocean is

The force responsible for holding the moon in its orbit around the earth against the gravitational pull of the earth is

The hatch door of a submarine has an area of 0.5m2. The specific gravity of sea water is 1.03. Assume that g = 10ms-1,and neglect the atmospheric pressure. T...

When equal weights of iron and water are subjected to equal supply of heat, it is found that the piece of iron become more hotter than water after a short ti...

One of the following readings represents the measurement of the length of a metal rod using vernier callipers, Taking the reading accuracy into consideration...

A man stands on a spring scale placed in a lift. The lift descends at constant velocity. As a result, the scale reads a weight