English Medium Class 10 - CBSE Question Bank Solutions

Draw a schematic diagram of an electric circuit consisting of a battery of two cells each of 1.5 V, 5 Ω, 10 Ω and 15 Ω resistors and a plug key, all connected in series.

Distinguish between an open and a closed circuit.

State the relation between work, charge and potential difference for an electric circuit.

Answer the following question.
An electric lamp of resistance 20 Ω and a conductor of resistance 4 0 are connected to a 6 V battery as shown in the circuit. Calculate: 

(a) the total resistance of the circuit,  

(b) the current through the circuit, 

(c) the potential difference across the  (i) electric lamp and (ii) conductor, and

(d) power of the lamp.

At the time of short circuit, the electric current in the circuit ______.

Answer the following question.
What is the function of a galvanometer in a circuit?

Two electric bulbs rated 100 W; 220 V and 60 W; 220 V are connected in parallel to electric mains of 220 V. Find the current drawn by the bulbs from the mains.

Study the following circuit and find out:
      (i) Current in 12 Ω resistor.
      (ii) The difference in the readings of A₁ and A₂, if any.

A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure.

Which form of carbon is found in Golkonda mines of Karnataka?

Which of the following statements about graphite and diamond is true?

Conventionally, the direction of the current is taken as:

Coulomb is the SI unit of ____________.

When an electric current is passed, electrons move from:

What is the difference between genetic drift and change due to natural selection?

What happens when

1. ZnCO₃ is heated in the absence of oxygen?
2. a mixture of Cu₂O and Cu₂S is heated?

A non-metal A which is the largest constituent of air, when heated with H₂ in 1:3 ratio in the presence of catalyst (Fe) gives a gas B. On heating with O₂ it gives an oxide C. If this oxide is passed into water in the presence of air it gives an acid D which acts as a strong oxidising agent.

1. Identify A, B, C and D
2. To which group of periodic table does this non-metal belong?

According to the evolutionary theory, formation of a new species is generally due to

From the list given below, select the character which can be acquired but not inherited