Refraction of Light at Plane Surfaces — Physics STD 10 — Question

The size of pulleys __________ towards the load and ___________ towards rigid support.

An object is placed at a distance of more than 40 cm from a convex lens of focal length 20 cm . The image formed is real, inverted and ______________ .

A lightning strikes a window pane and produces a crack in it. This crack appears silvery because of ___________ .

A stone placed at the bottom of a water tank appears raised by 80 cm. If the refractive index of water is 4/3, then the actual depth of water in the tank is:

In block and tackle system of pulleys the velocity ratio is ___________ .

Calculate the height through which a crane can lift a load of 4 tonne when a motor of 1000 W is operating for 20 sec.:

Horse-shoe magnet has a shape of ____________ .

A potentiometer is connected to a cell through switch in series. To one end of the potentiometer is attached a voltmeter with the help of connecting wire and a jockey, When the jockey is moved over the potentiometer wire from zero end to 100 cm the reading shown by voltmeter is likely to:

A cord stretched among the 2 constant supports, is plucked precisely within side, the centre after which is released. It executes, which type of vibrations consider resistance of medium

If the intensity of light entering the lens decreases the intensity of image formed by it __________ .