English Medium Class 10 - CBSE Question Bank Solutions for Science

Which has less electrical resistance : a thin wire or a thick wire (of the same length and same material)?

Distinguish between good conductors, resistors and insulators. Name two good conductors, two resistance and two insulators.

Classify the following into good conductors, resistors and insulators:

Rubber, Mercury, Nichrome, Polythene, Aluminium, Wood, Manganin, Bakelite, Iron, Paper, Thermocol, Metal coin

 What is meant by the "resistance of a conductor" ? Write the relation between resistance, potential difference and current.

 What happens to the resistance as the conductor is made thinner?

Name the electrical property of a material whose symbol is "omega".

What happens to the resistance as the conductor is made thicker?

Which among iron and mercury is a better conductor of electricity?

Which has more resistance: 

 a long piece of nichrome wire or a short one?

Which has more resistance:    

 a thick piece of nichrome wire or a thin piece?

What do you understand by the "resistivity" of a substance?

What will be the resistance of a metal wire of length 2 metres and area of cross-section 1.55 × 10⁻⁶ m² if the resistivity of the metal be 2.8 × 10⁻⁸ Ω m?

 Give two examples of substances which are good conductors of electricity. Why do you think they are good conductors of electricity?

Calculate the resistance of a copper wire 1.0 km long and 0.50 mm diameter if the resistivity of copper is 1.7 × 10⁻⁸ Ω m.

How does the resistance of a conductor depend on: 

length of the conductor?

How does the resistance of a conductor depend on: 

 area of cross-section of the conductor?

How does the resistance of a conductor depend on: 

 temperature of the conductor?

What would be the effect on the resistance of a metal wire of:

increasing its length?

What would be the effect on the resistance of a metal wire of:  

 increasing its diameter?