1. The resistance R of a conductor depends on its: *
1 point
a. length.
b. area.
c. temperature.
d. all of them.
2. Length of a wire is doubled keeping the potential difference across its ends same, the current flowing through it will be, *
1 point
a. doubled.
b. halved.
c. remains the same.
d. current does not depend on length.
3. A current of 5 ampere is passed through a wire for 10 seconds; the amount of charge passed through it is, *
1 point
a. 50 C.
b. 0.5 C.
c. 2 C.
d. 50 A.
4. The amount of work done by a battery of 12 V, in transferring a charge of 5 C is……….. *
1 point
a. 1.4 J
b. 12 J
c. 5 J
d. 60 J
5. The length of a wire is halved by compressing it, its resistivity will be, *
1 point
a. halved.
b. doubled.
c. remain the same.
d. Can’t say anything.
6. The SI unit of resistivity of material of conductor is…… *
1 point
a. Ω.
b. Ωm.
c. volt.
d. ampere.
7. What happens to the resistance and resistivity with rise in temperature?A. Resistance increases.B. Resistivity increases. C. Resistance increases but Resistivity decreases. D. Both A and B are correct. *
1 point
a. A
b. B
c. C
d. D
8. The length L, of a wire of resistance R, is doubled by stretching it, the new resistance of the wire will be………. *
1 point
a. R.
b. 2R.
c. R/2.
d. none of these.
9. A current of 15 A is passed through a wire of resistance 12 Ω, what is the potential difference between its ends?a. *
1 point
1.25 V.
b. 180 V
c. 0.8 V
d. none of these.
10. (i). An ammeter has very high resistance.(ii). A voltmeter has very low resistance. *
1 point
a. Both (i) and (ii) are correct.
b. (i) is correct but (ii) is incorrect.
c. Bothe (i) and (ii) are incorrect.
d. (i) is incorrect but (ii) is correct.
11. A solar cooker is painted black from inside because ……. *
1 point
a. It protects from inside.
b. It looks good.
c. It absorbs the heat.
d. It is good conductor of heat.
12. Biogas contains 75 % , *
1 point
a. Carbon dioxide.
b. Methane.
c. Hydrogen.
d. Hydrogen sulphide.
13. The energy can be harnessed from the sea in the form of ……. *
1 point
a. Tidal energy.
b. Wave of energy.
c. Ocean thermal energy.
d. All of these.
14. We cannot depend on fossil fuel for our energy requirements because…. *
1 point
a. they are costly.
b. they are not easily available.
c. they are non-renewable.
d. All of these.
15. What is incorrect about solar energy? *
1 point
a. it is a renewable source.
b. Clean source of energy.
c. It can be use anytime.
d. It is free of cost.
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Answered by
1
Answer:
- d
- b
- a
- d
- c
- b
- d
- b
- b
- c
- c
- b
- d
- d
- b
these are the answer
Answered by
1
Answer:
d
b
a
d
c
b
d
b
b
c
c
b
d
d
b
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