(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

A coolie carrying a load on his head and moving on a frictionless horizontal platform does no work. Explain the reason why.

The world record for weight lifting was held by Sergei Didyk of the USSR. He lifted 261 kg to a height of 2.3 m in 4s; find:
(a) Weight lifted by him
(b) Work done by him
(c) Power developed by him. (g = 10m/s²)

A machine raises a load of 750 N through a height of 16 m in 5 seconds. Calculate the power at which the machine works.

State the C.G.S. unit of work. How it is related to its S.I. unit?

A coolie carries a load of 30 kgf through a distance of 500 m in 5 minutes while another coolie B carries the same load through the same distance in 10 minutes. Compare the
(i) work done, and
(ii) power developed. (Take: g = 10md⁻²)

A man weighing 700 N runs up a flight of 15 steps, each 20 cm high, in 5 seconds. Calculate the power of the man.

A force of 1 kgf displaces a body by a distance of 10 cm
(i) in direction of force,
(ii) normal to the force
(iii) at an angle of 60° to the direction of the force.
Calculate the amount of work done in each case. (Take: g = 9.8 ms⁻² )

Why fuse wire must always be connected in ‘live’ wire? Explain.

Where are the cartridge type fuse used?

What is the rating of fuse used in light and fan circuits?

What is the rating of fuse used in power circuits, in domestic use?

What is an ‘electric fuse’? State its two characteristics of electric fuse.

Explain the significance of kWh meter, main switch and main fuse in house-circuiting.

Name any two electromagnetic waves which have a frequency higher than that of violet light. State one use of each.

How will you investigate the existence of the radiation beyond the red and violet extremes of the spectrum?

Name two sources of ultraviolet radiation.

Name two sources of infrared radiation.

State two properties of infrared radiations which differ from visible light.

State three properties of infrared radiations similar to that of visible light.

State three properties of ultra-violet radiation similar to visible light.