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

The diagram in Fig shows two forces F₁ = 5 N and F₂ = 3 N acting at points A and B respectively of a rod pivoted at a point O, such that OA = 2 m and OB = 4 m.

Calculate:

1. the moment of force F₁ about O.
2. the moment of force F₂ about O.
3. total moment of the two forces about O.

A body, when acted upon by a force of 20 kgf, gets displaced by 1 m. Calculate the work done by the force, when the displacement is

1. in the direction of force,
2. at an angle of 60° with the force, and
3. normal to the force. (g = 10 N kg^-1)

Mechanical advantage = ______  × velocity ratio.

Two sets A and B each of four bulbs are glowing in two separate rooms. When one of the bulbs in set A is fused, the other three bulbs also cease to glow. But in set B, when one bulb fuses, the other bulbs continue to glow. Which set of arrangement is preferred in housing circuit and why?

The human ear can detect continuous sounds in the frequency range from 20 Hz to 20,000 Hz. Assuming that the speed of sound in air is 330 m s⁻¹ for all frequencies, calculate the wavelengths corresponding to the given extreme frequencies of the audible range.

How is the frequency of a stretched string related to its length?

How is the frequency of a stretched string related it’s tension?

State two causes of energy loss in a transformer.

A wire of length 80 cm has a frequency of 256 Hz. Calculate the length of a similar wire under similar tension, which will have frequency 1024 Hz

A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m.

1) Calculate the speed with which this sound travels

2) What difference would be felt by a listener between the above sound and another sound traveling at the same speed, but of wavelength 2.6 m?

Calculate the quantity of heat produced in a 20 Ω resistor carrying 2.5 A current in 5 minutes.

A battery of emf 12 V and internal resistance 2 Ω is connected with two resistors A and B of resistance 4 Ω and 6 Ω respectively joined in series.

Find:

1) Current in the circuit

2) The terminal voltage of the cell

3) The potential difference across 6Ω Resistor

4) Electrical energy spent per minute in the 4Ω resistor.

Name the characteristic of sound in relation to its waveform.

The displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below.

Study the two sound waves and compare their:

1. Amplitudes
2. Wavelengths

You have three resistors of values 2Ω, 3Ω and 5Ω. How will you join them so that the total resistance is more than 7Ω?

1) Draw a diagram for the arrangement

2) Calculate the equivalent resistance.

State whether the resistivity of a wire changes with the change in the thickness of the wire.

 Define the unit of resistance (or Define the unit "ohm").

Write S.I. unit of moment of couple.

What do you understand by the term couple?

Prove that

Moment of couple = Force × couple arm.