Question

I) Choose the correct option:
1. Electric charge can flow through:
(a) Insulator (b) Conductor
(c) both of these (d) None of these
2. Rekha studies that earthing provides advantages to the electric appliances
during lightning. What advantages does a lightning conductor provide?
(a) it generates additional electricity in the circuit
(b) it improves the performance of the appliances
(c) it prevents running of excessive current through the circuit
(d) it reduces the amount of electricity consumed by the appliance
3. The loudness of sound is measured in units of
(a) Decibel (dB) (b) Hertz (Hz)
(c) Metre (m) (d) Metre/Second (m/s)
4. Which of the following statements is correct regarding rods and cones in
the human eye?
(a) Cones are sensitive to dim light
(b) Cones are sensitive to bright light
(c) Rods are sensitive to bright light
(d) Rods can sense colour
5. When a glass rod is rubbed with a piece of silk cloth the rod acquires :
(a) positive charges (b) negative charges
(c) no charge (d) either positive or negative charges
6. A student studies that vigorous movement of air current and water droplet,
results in building up of charges in the clouds. Which phenomenon might
have resulted with the discharge of the built-up charges in nature?
(a) earthquake (b) lightning
(c) rainfall (d) tornadoes
7. Which of the following cannot be charged easily by friction?
(a) A plastic scale (b) A copper rod
(c) An inflated balloon (d) A woollen cloth
8. When two objects are rubbed against each other
(a) one will lose and other will gain electron
(b) both will lose electron
(c) both will gain electron
(d) None of these

9. What happens to the pitch, when we tighten the strings of a guitar?
(a) It increases (b) It decreases
(c) It remains the same (d) It may increase or decrease
10. Pitch of sound is determined by its
(a) frequency (b) amplitude
(c) speed (d) loudness
11. The two plane mirrors are kept at the following angles one by one. In which
case is the number of images formed maximum?
(a) 30 degree (b) 60 degree
(c) 45 degree (d) 90 degree
II. Short answer questions:
1. A plane mirror always forms the image of an object exactly on the reflecting
surface. (TRUE/FALSE)
2. Frequency of sound is expressed in _________.
3. 1 Hz is equal to 1 vibration per minute. (TRUE/FALSE)
4. The process of transferring charge from a charged object to the earth is
called _________.
5. Is the reflection of light by the smooth walls of your house regular or
irregular.
6. The angle of incidence of a ray on a mirror is the angle that the ray makes
with the mirror at the point of incidence. (TRUE/FALSE)

Answer 1

Answer:

1. C
2. C
3. B
4. A and D
5. D
6. C
7. D
8. D
9. D
10. D
11. D

• Short Answer Questions

1. True
2. Wavelength
3. False
5. regular
6. True

Explanation:

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Answer 2

Answer:

The decentralization processes also have consequences, often unintended, for a wide range of political and economic issues such as corruption, party systems, and turnout, on the one hand, and poverty and inequality, long-run macroeconomic performance, the development of social capital, and effectiveness of tax