English Medium Class 10 - CBSE Question Bank Solutions for Science

Ohm's law gives a relationship between:

(a) current and resistance
(b) resistance and potential difference
(c) potential difference and electric charge
(d) current and potential difference

The unit of electrical resistance is:

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

Keeping the p.d. constant, the resistance of a circuit is halved. The current will become:

(a) one-fourth
(b) four time
(c) half
(d) double

The graph between V and I for a conductor is a straight line passing through the origin. 

 Which law is illustrated by such a graph?

The graph between V and I for a conductor is a straight line passing through the origin. 

 What should remain constant in a statement of this law?

Fill in the following blank with suitable words: 

Resistance is measured in .............. The resistance of a wire increases as the length ..............; as the temperature ..............; and as the cross-sectional area .............. .

How should the two resistances of 2 ohms each be connected so as to produce an equivalent resistance of 1 ohm?

The resistors R₁, R₂, R₃ and R₄ in the figure given below are all equal in value. 

What would you expect the voltmeter A, B and C to read assuming that the connecting wires in the circuit have negligible resistance?

Four resistances of 16 ohms each are connected in parallel. Four such combinations are connected in series. What is the total resistance? 

How much energy is consumed when a current of 5 amperes flows through the filament (or element) of a heater having resistance of 100 ohms for two hours? Express it in joules.

 A resistance of 40 ohms and one of 60 ohms are arranged in series across 220 volt supply. Find the heat in joules produced by this combination of resistances in half a minute.

What is the other name of Maxwell's right-hand thumb rule?

State and explain Maxwell's right-hand thumb rule.

Name the rule which gives the direction of induced current.

If we happen to touch a hot object unknowingly, we immediately pull back our hand. What is this type of action known as?

Name the most important part of the human brain.

State one function each of cerebellum and pons.

State and explain Fleming's right hand rule.

Name and state the rule to find the direction of current induced in a coil due to its rotation in a magnetic field.

Name two parts of the body which contain receptors of chemical stimuli.