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

Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of liquid, at a particular temperature the glass piece is not seen. When is the glass piece not seen?

When a lighted candle is held in front of a thick plane glass mirror, several images can be seen, but the second image is the brightest, give reason.

When light travels from a rarer to a denser medium, its speed ______.

When a ray of light from air enters a denser medium, it ______.

The highest refractive index is of ______.

An electric heater of power 3 kW is used for 10 h. How much energy does it consume? Express your answer in

1. kWh,
2. joule.

A ray of light of wavelength 6600 Å suffer refraction from air to glass. Taking \[\ce{_a\mu_g = \frac{3}{2}}\], find the wavelength of light in glass.

With the help of diagram of the principal section of a prism, indicate its refracting surfaces, refracting edge and base. 

How does the angle of deviation produced by a prism change with increase in the angle of incidence. Draw a curve showing the variation in the angle of deviation with the angle of incidence at a prism surface.

How does the angle of minimum deviation produces by a prism change with increase in :

the wavelength of incident light 

How does the angle of minimum deviation produces by a prism change with increase in : 

the refracting angle of prism? 

Answer the following questions in your own words.

What is meant by scattering of light?

How does the intensity of scattered light depend on the wavelength of incident light? State conditions when this dependence holds.

The sky at noon appears white. Give reason.

What is meant by the natural frequency of vibration of a body?

What are non-ohmic reistors? Give one example and draw a graph to show its current-voltage relationship. 

On What factors does the natural frequency of vibration of a body depend?

Give two differences between an ohmic and non-ohmic resistor.

The following figure shows the I-V characteristic curves for two resistors. Identify the ohmic and non-ohmic resistors. Give a reason for your answer. 

(a)	(b)

State one condition for a body to execute free/natural vibrations.