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

How is the magnetic field due to a straight current carrying wire affected if current in wire is decreased?

How is the magnetic field due to a straight current carrying wire affected if current in wire is reversed?

A ray of light A incident from air suffers partial reflection and refraction at the boundary of water. 

1. Complete the diagram showing (i) the reflected ray B and (ii) the refracted ray C.
2. How are the angles of incidence i and refraction r related?

A small air bubble in a glass block when seen from above appears to be raised because of ______.

Define couple. 

Define the moment of force.

Give an example for each of the following uses of a machine:

to change the point of application of force

Give an example of the following uses of a machine:

 to change the direction of force

One joule is the amount of work done when a force of ......... moves a body through a distance of .......

What is the work done when no net force is applied on the body?

A wheel of diameter 3 m is shown in fig. 2 with axle at 0. A force F = 8 N is applied at Q in the direction shown in figure. Calculate the moment of force about:
(i)    centre o, and
(ii)    point p.

Calculate the resultant moment of forces about O and state its direction in fig. 

Fig. 5 shows a uniform meter scale weighing 200 gf. Provided at its centre. Two weights 300 gf and 500 gf are suspended from the ruler as shown in the diagram. Calculate the resultant torque of the ruler and hence calculate the distance from mid-point where a 100 gf should be suspended to balance the meter scale.

(i) What do you understand by the term couple of forces?
(ii) Calculate the moment of a couple shown in fig.

Three forces A, B and C are acting on a rigid body which can turn about O in fig.9. If all the three forces are applied simultaneously, in which direction will the body move? Explain.