English Medium Class 10 - CBSE Question Bank Solutions for Science

The least distance of distinct vision for a young adult with normal vision is about ______.

Why is a normal eye not able to see clearly the objects placed closer than 25 cm?

What happens to the image distance in the eye when we increase the distance of an object from the eye?

What does an electric circuit mean?

Define the unit of current.

Calculate the number of electrons constituting one coulomb of charge.

Draw the structure of a neuron.

Write a and b in the given flow chart of the neuron through which information travels as an electrical impulse.

Why are metals good conductors of electricity whereas glass is a bad conductor of electricity? Give reason?

A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.

In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.

The work done in moving a unit charge across two points in an electric circuit is a measure of: 

(a) current
(b) potential difference
(c) resistance
(d) power

Which of the following units could be used to measure electric charge?

(a) ampere
(b) joule
(c) volt
(d) coulomb

One coulomb charge is equivalent to the charge contained in:

(a) 2.6 × 10¹⁹ electrons
(b) 6.2 × 10¹⁹ electrons
(c) 2.65 × 10¹⁸ electrons
(d) 6.25 × 10¹⁸ electrons

Three 2 V cells are connected in series and used as a battery in a circuit.

 What is the p.d. at the terminals of the battery?

Three 2 V cells are connected in series and used as a battery in a circuit. 

How many joules of electrical energy does 1 C gain on passing through (i) one cell (ii) all three cells?

The atoms of copper contain electrons and the atoms of rubber also contain electrons. Then why does copper conduct electricity but rubber does not conduct electricity?

By what name is the physical quantity coulomb/second called?

What is the Flow of Charge Called?

What actually travels through the wires when you switch on a light?

Which particles constitute the electric current in a metallic conductor?