Some Natural Phenomena Worksheet-4

Some Natural Phenomena Worksheet-4

1. A negatively charged rod is brought close to two metal spheres which are in contact with each other, and the spheres are separated in the presence of the rod. Then

(a) the sphere close to the rod acquires a negative charge and the other sphere acquires a positive charge

(b) the sphere close to the rod acquires a positive charge and the other sphere acquires a negative charge

(c) both the spheres will acquire positive charge

(d) both the spheres will acquire negative charge

2. According to law of electrostatics

(a) a charged body attracts similar charged bodies but repels uncharged bodies.

(b) a charged body attracts the bodies carrying similar charge and repels the bodies possessing opposite charge

(c) a charged body repels the bodies possessing similar charge and attracts the bodies with opposite charge

(d) a charged body attracts all types of other charged bodies

3. Which of the following will rise the highest?

(a) Air at 10°C                               (b) Air at 40°C

(c) Air at 20°C                              (d) Air at -5°C

4. Which of the following is most likely to be in the 'eye' of a cyclone?

(a) It is an area of high pressure

(b) It is an area of a low pressure

(c) It has lots of clouds and rains

(d) It has high speed winds

5. During the formation of rain, when water vapour changes back to liquid in the form of rain drops:

(a) heat is absorbed

(b) heat is released

(c) heat is first absorbed and then released

(d) there is no exchange of heat

6. Which of the following statement is NOT true?

(a) lightning and spark from wollen clothing are essentially the same phenomena.

(b) when you rub a plastic scale on your dry hair, it acquires a charge.

(c) charge acquired by a glass rod when it is rubbed with silk is called as negative charge.

(d) static charges are called so, because they donot move by themselves.

7. Earthing is provided in buildings to protect it from:

(a) Lightning                                 (b) leakage of electric current

(c) Cyclone                                     (d) Thunderstorm

8. Wind currents are generated due to:

(a) shape of earth                         (b) change in atmospheric pressure

(c) Thunderstorm                        (d) Cyclone

9. The fragmented outermost layers of earth are known as:

(a) Crusts          (b) Plates           (c) Cores            (d) Zones

10. Earthquake at two places A and B were measured by a seismograph which recorded the magnitude as 2 and 4. The magnitude of tremors and its destructive energy at A and B can be compared as under:

(a) Tremor at B are two times that at place 'A'

(b) Tremor at B are four times that at place 'A'

(c) Tremor at B are 100 times that at place 'A'

(d) Tremor at B are 1000 times that at place 'A'

Answer Key:

(1)-(b); (2)-(c); (3)-(b); (4)-(b); (5)-(b); (6)-(c); (7)-(b); (8)-(a); (9)-(b); (10)-(c)