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

State one advantage of single movable pulley.

The diagram below shows two parallel rays A (Orange) & B (Blue) incident from air, on air-glass boundary.

1. Copy and complete the path of the rays A and B.
2. How do the speeds of these rays differ in glass?
3. Are the two refracted rays in glass parallel? Give a reason.

A radioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will ______.

Why should she connect more number of pulleys in the upper fixed block?

Complete the following radioactive reaction:

\[\ce{^-_-X -> ^-_-Y + ^4_2He -> ^234_91Z + ^0_-1e}\]

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?