Secondary School (English Medium) (5 to 8) इयत्ता ८ - CBSE Question Bank Solutions for Science

Voice of which of the following is likely to have minimum frequency?

Identify the part which vibrates to produce sound in the following instrument.

Dholak

Identify the part which vibrates to produce sound in the following instrument.

Sitar

Identify the part which vibrates to produce sound in the following instrument.

Flute

Sketch larynx and explain its function in your own words.

The passage of an electric current through a solution causes ______ effects.

If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the ______ terminal of the battery.

The process of depositing a layer of any desired metal on another material by means of electricity is called ______.

Name three liquids, which when tested in the manner shown in Figure, may cause the magnetic needle to deflect.

Prepare a list of objects around you that are electroplated.

The process that you saw in the image is used for the purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transferred to the thin copper plate. Which electrode should be attached to the positive terminal of the battery and why?

Which of the following cannot be charged easily by friction?

Like charges attract each other.

Explain why a charged body loses its charge if we touch it with our hand.

Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?

State the laws of reflection.

Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.

A person 1 m in front of a plane mirror seems to be ______ m away from his image.

If you touch your ______ ear with your right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with your ______.

Angle of incidence is equal to the angle of reflection.