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

In the following atoms, which one is a radioisotope? Give one use of this isotope.

O¹⁶, C¹⁴, N¹⁴, He⁴

A block and tackle system of pulleys has a velocity ratio of 4.

1. Draw a labelled diagram of the system indicating clearly the direction of the load and effort.
2.  Calculate the potential energy of the load 100 kgf lifted by this pulley to a height 5 m. (g = 10 ms⁻²)

Name the type of single pulley that has an ideal mechanical advantage equal to 2. Draw a labelled diagram of the pulley mentioned by you.

Which colour of white light travels fastest in any medium except air?

A ray of light strikes the surface of a rectangular glass slab such that the angle of incidence in air is

1. 0°,
2. 45°.

In each case, draw a diagram to show the path taken by the ray as it passes through the glass slab and emerges from it.

Where can a body execute natural vibrations?

Why is the switch put in the live wire?

What precaution do you take while handling a switch?

Name the wire to which a switch is connected.

Define kilowatt hour.

What is lateral displacement?

Why does sun appear red at sunrise and sunset?

Give one example of damped vibrations

Draw the diagram of a dual control switch when the appliance is switched ‘ON’.

Which color of white light is scattered the least and why?

Why does the amplitude of a vibrating body continuously decrease during damped vibrations?

Describe a simple experiment to verify the principle of moments, if you are supplied with a metre rule, a fulcrum and two springs with slotted weights.

A uniform metre rule is pivoted at its mid-point. A weight of 50 gf is suspended at one end of it. Where should a weight of 100 gf be suspended to keep the rule horizontal?

The diagram below shows a uniform bar supported at the middle point O. A weight of 40 gf is placed at a distance of 40 cm to the left of the point O. How can you balance the bar with a weight of 80 gf?

When a boy weighing 20 kgf sits at one end of a 4 m long see-saw, it gets depressed at this end. How can it be brought to the horizontal position by a man weighing 40 kgf.