English Medium कक्षा १० - CBSE Question Bank Solutions

State the law that explains the heating effect of current with respect to the measurable properties in an electrical circuit.

Anannya responded to the question: Why do electrical appliances with metallic bodies are connected to the mains through a three-pin plug, whereas an electric bulb can be connected with a two-pin plug?

She wrote: Three-pin connections reduce heating of connecting wires.

1. Is her answer correct or incorrect? Justify.
2. What is the function of a fuse in a domestic circuit?

An electric iron of resistance 20 Ω draws a current of 5 A. The heat developed in the iron in 30 seconds is ______.

Name the phenomenon responsible for the following effect:

When we sit in front of a plane mirror and write with our right hand, it appears in the mirror that we are writing with the left hand.

If an object is placed at a distance of 10 cm in from of a plane mirror, how far would it be from its image?

Which property of light makes a pencil cast a shadow when it is held in front of a light source?

Fill in the following blank with a suitable word:
When light is reflected, the angles of incidence and reflection are ............ .

State whether the following statement is true of false:
A student says that we can see an object because light from our eyes is reflected back by the object.

Where is the image when you look at something in a mirror?

A ray of light strikes a plane mirror such that its angle of incidence is 30°. What angle does the reflected ray make with the mirror surface?

The letter F is placed in front of a plane mirror:

1. How would its image look like when seen in a plane mirror?
2. What is the name of the phenomenon involved?

What is lateral inversion? Explain by giving a suitable example.

Write the word AMBULANCE as it would appear when reflected in a plane mirror. Why is it sometimes written in this way (as its mirror image) on the front of an ambulance?

What are the important differences between looking at a photograph of your face and looking at yourself in a plane mirror?

A wall reflects light and a mirror also reflects light. What difference is three in the way they reflect light? 

 Which type of reflection of light leads to the formation of images?

What is the difference between regular reflection of light and diffuse reflection of light? 

What type of reflection of light takes place from a cinema screen?

 A boy with a mouth 5 cm wide stands 2 m away from a plane mirror. Where is his image and how wide is the image of his mouth?

The boy walks towards the mirror at a speed of 1 m/s. At what speed does his image approach him?