(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

When current flows in a wire, it creates ______.

State two differences between the e.m.f and terminal voltage of a cell. 

The present of magnetic field at a point can be detected by ______.

By reversing the direction of current in a wire, the magnetic field produced by it:

A wire of uniform thickness with a resistance of 27Ω is cut into three equal pieces and they are joined in parallel. Find the equivalent resistance of the parallel combination. 

Calculate the effective resistance between the points A and B in the network shown below in Figure 8.45   

Calculate the equivalent resistance between A and B in the adjacent diagram.

In the network shown in the following adjacent Figure, calculate the equivalent resistance between the points.  

1. A and B
2. A and C

Two resistors of 2.0 Ω and 3.0 Ω are connected (a) in series (b) in parallel, with a battery of 6.0 V and negligible internal resistance. For each case draw a circuit diagram and calculate the current through the battery. 

A wire of length 5 m has a resistance of 2.0 Ω calculate:
(a) the resistance of wire of length 1 m
(b) the equivalent resistance if two such wires each of length 2 m are joined in parallel.
(c) the resistance of 1 m length of wire of same material but of half diameter. 

A cell supplies a current of 1.2 A through two 2 Ω resistors connected in parallel. When the resistors are connected in series, it supplies a current of 0.4 A. Calculate:

(i) the internal resistance and (ii) e.m.f. of the cell. 

The following circuit diagram shows three resistors 2 Ω, 4 Ω and R Ω connected to a battery of e.m.f 2V and internal resistance 3 Ω. If the main current of 0.25 A flows through the circuit, find:

1. the p.d. across the 4 Ω resistors,
2. the p.d. across the internal resistance of the cell,
3. the p.d. across the R Ω or 2 Ω resistors, and
4. the value of R.

Three resistors of 6.0 𝛀, 2.0𝛀 and 4.0𝛀 are joined to an ammeter A and a cell of e.m.f. 6.0 V as
shown in fig 8.52 Calculate:
(a) the effective resistance of the circuit and
(b) the reading of ammeter. 

Show by a diagram, the refraction of two light rays incident parallel to the principal axis on a concave lens by treating it as a combination of a glass block and two triangular glass prisms.

Write S.I. unit of temperature.

Give scientific reason for the following:

 A man runs in the direction of train while getting down from a moving train.

Fig shows a thin beam of white light from a source S striking on one face of a prism.

1. Complete the diagram to show the effect of the prism on the beam and to show what is seen on the screen.
2. If a slit is placed in between the prism and the screen to pass only the light of green colour, what will you then observe on the screen?
3. What conclusion do you draw from the observation in part (b) above?