(English Medium) ICSE Class 10 - CISCE Important Questions for Physics

Is it possible for a concave lens to form an image of size two times that of the object? Write Yes or No.

A convex lens of focal length 10 cm is placed at a distance of 60 cm from a screen. How far from the lens should an object be placed so as to obtain a real image on the screen?

Linear magnification (m) produced by a concave lens is ______.

A block of glass is pushed into the path of the light as shown below. Then the converging point x will:

The image of a candle flame placed at a distance of 36 cm from a spherical lens, is formed on a screen placed at a distance of 72 cm from the lens. Calculate the focal length of the lens and its power.

Mixture of red + blue + green is passed through a convex lens as shown in the diagram below. State whether the ray passes through a single point or through different points on the principal axis after refraction.

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

Name the high energetic invisible electromagnetic waves which help in the study of the structure of crystals

State an additional use of the X-rays waves

Name the subjective property of light related to its wavelength.

Name the radiation which can be detected by a thermopile.

Why is the colour red used as a sign of danger?

A wave has wavelength 50 Å.

1. Name the wave.
2. State its speed in vacuum.
3. State its one use.

The smoke from a fire looks white. Which of the following statements is true?

1) Molecules of the smoke are bigger than the wavelength of light

2) Molecules of the smoke are smaller than the wavelength of light.

To which regions of the electromagnetic spectrum do the following wavelengths belong: 
(a) 250 nm 
(b) 1500 nm 

Calculate the shortest wavelength of electromagnetic radiation present in Balmer series of hydrogen spectrum.

Name two sources of ultraviolet radiation.

A ray of light is incident at 45° on an equilateral prism in the diagram below.

1. Name the phenomenon exhibited by the ray of light when it enters and emerges out of the prism.
2. State the cause of the above phenomenon mentioned by you.

Assertion (A): Ultraviolet radiations is scattered more as compared to the microwave radiations.

Reason (R): Wavelength of ultraviolet radiation is more than the wavelength of microwave radiation.

Below is an incomplete table showing the arrangement of electromagnetic spectrum in the increasing order of their wavelength. Complete the table:

1. Identify the radiation A.
2. Name the radiation used to detect fracture in bones.
3. Name one property common to both A and Radio waves.