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

The adjacent diagram shows a small magnet placed near a solenoid. State whether the magnet is attracted or repelled, as the switch is pressed. Give a reason.

What is a solenoid? Why do we usually keep its diameter small in comparison to its length?

State the principle of moments.

The diagram below shows a magnet moved near a coil along its axis. Which of the diagram shows correct flow of current during this motion?

The diagram below shows an insulated copper wire wound around a hollow cardboard cylindrical tube. Answer the questions that follow:

1. What are the magnetic poles at A and B when the key K is closed?
2. State two ways to increase the strength of the magnetic field in this coil without changing the coil.
3. If we place a soft iron bar at the centre of the hollow cardboard and replace the DC source with an AC source then will it attract small iron pins toward itself when the current is flowing through the coil?

In the above diagram Lata stands between two cliffs and claps her hands.

Determine the time taken by her to hear the first echo. Speed of sound in air 320 ms^-1.

The voltage - current readings of a certain material are shown in the table given below:

Study the table.

1. State whether the conductor used is ohmic or non-ohmic.
2. Justify your answer.
3. State Ohm's law.

Current is flowing through a coil as shown in the figure. Which one of the given figures will correctly depict the magnetic polarity and the direction of the lines of force along the axis of the coil?

The circuit depicted in the figure is employed for studying Ohm’s Law. Instead of using a standard resistor, a student opts for a glass tube filled with mercury (tube 1), connected to the circuit through two electrodes, E1 and E2. He records the readings of the ammeter and voltmeter, thereby calculating the resistance. The student repeats the experiment by substituting tube 1 with tube 2, where the same amount of mercury fills tube 2.

Neglecting internal resistance of the cell use (> or < or =) to compare:

1. the resistance in both the cases.
2. the voltmeter readings in both the cases.
3. the specific resistance in both the cases.

1. Give a list of at least five radiations, in the order of their increasing wavelength, which make up the complete electromagnetic spectrum.
2. Name the radiation mentioned by you in part (a) which has the highest penetrating power.

Name the region just beyond the red end.

Name the region just beyond the violet end, of the spectrum.

A current of 3.2 mA flows through a conductor. If charge on an electron is −1.6 × 10^-19 coulomb, find the number of electrons that will pass each second through the cross section of that conductor.

Define heat capacity and state its SI unit.

A solid of mass 50 g at 150 °C is placed in 100 g of water at 11 °C when the final temperature recorded is 20 °C. Find the specific heat capacity of the solid. (specific heat capacity of water = 4.2 J/g °C)

You have a choice of three metals A, B, and C, of specific heat capacities 900 Jkg^-1 °C^-1, 380 Jkg^-1 °C^-1 and 460 Jkg^-1 °C-1 respectively, to make a calorimeter. Which material will you select? Justify your answer.

Calculate the mass of ice needed to cool 150 g of water contained in a calorimeter of mass 50 g at 32 °C such that the final temperature is 5 °C. Specific heat capacity of calorimeter = 0.4 J g^-1 °C^-1, Specific heat capacity of water = 4.2 J g^-1°C^-1, latent heat capacity of ice = 330 J g^-1.

Calculate the mass of ice required to lower the temperature of 300 g of water 40°C to water at 0°C.

(Specific latent heat of ice = 336 J g⁻¹, the Specific heat capacity of water = 4.2J g⁻¹ °C⁻¹)

What do you understand by the following statement:

The heat capacity of the body is 60 JK⁻¹.

What do you understand by the following statement:

The specific heat capacity of lead is 130 J kg⁻¹K⁻¹.