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

Tick (✓) the correct choice among the following :
(a) A strong short bar magnet is dropped into a solenoid connected to a
galvanometer as shown in fig . The galvanometer shows a deflection to the left when the current in the coil as seen from above is counter clockwise. Which one of the following shows the correct deflection of the galvanometer when the magnet is at posi tions A, Band C.

Tick (✓) the correct choice among the following :

Which of the following changes would enable a millimeter to be used as a
direct current ammeter reading upto 1 A?

Tick (✓) the correct choice among the following :

In fig .XY is at right angles to the magnetic field. The direction in
which XY should be moved to induce an electron flow in the direction Y to X as indicated by the arrow is

Tick (✓) the correct choice among the following :

There are 500 turns and 2000 turns in the primary and secondary coil of a
transformer respectively. If th e output voltage is 1000 V, how large is the
input voltage?

Fig . shows the core of a transformer and i ts input and output connections 

State the material used for the core and describe th e structure of the core.
(a) Use the values given in the diagram to calculate the turns ratio for the transformer and connections, labeling all parts of the diagram .
(b) If a current of 2 A is taken from th e output, calculate th e current in the input circuit (Assume the transformer to be ideal ).

State the condition when on applying a force, the body has the rotational motion.

Write the seven prominent colours present in white light spectrum in order of their increasing wavelength.

Name the seven prominent colours of the white light spectrum in order of their increasing frequencies.

Name four colours of the spectrum of white light which have wavelength longer than blue light.

State whether the current is a scalar or vector?

Electrical power P is given by the expression P = (Q × V) ÷ time

(a) What do the symbols Q and V represent?

(b) Express the power P in terms of current and resistance explaining the meanings of symbols used there in.

State the S.I. units of electrical power.

Define the term kilowatt - hour and state its value in S.I. unit.

1 kWh = `(1 "volt" xx 1 "ampere" xx "_________")/1000`

Complete the following:

1 kWh = _________ J

An electric bulb is marked '100 W, 250 V'. What information does this convey?

Calculate the current through a 60 W lamp rated 250 V. If the line voltage falls to 200 V, how is power consumed by the bulb affected?

An electric bulb is rated '100 W, 250 V'. How much current will the bulb draw if connected to a 250 V supply?