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Free MCQs & Online Quiz Practice for Exams

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Q: The unit of electric field intensity is: (Entry test 2009)

A) Volt/metre

B) Newton/Coulmb

C) Joule/Coulomb meter

D) All of them

Answer: D. All of them

Q: Metals conduct electricity efficiently because they contain __________. (Entry test 2010)

A) only a few free electrons

B) a large number of free electrons

C) many electrons in bonds

D) very few electrons in bonds

Answer: B. a large number of free electrons

Q: A charge Q is divided into two parts q and Q-q and separated by a distance R. The force of repulsion between them will be maximum when:

A) q=Q/4

B) q=Q/2

C) q=Q/3

D) None of these

Answer: B. q=Q/2

Q: Three objects are brought close to each other, two at a time. When objects A and B are brought together, they attract. When objects B and C are brought together, they repel. From this, we conclude that:

A) objects A and C possess charges of the same sign

B) objects A and C possess charges of opposite sign

C) all three of the objects possess charges of the same sign

D) one of the objects is neutral

Answer: B. objects A and C possess charges of opposite sign

Q: Some charge is being given to a conductor. Then its potential:

A) Is maximum at surface

B) Is maximum at centre

C) Remains same throughout the conductor between the surface and the centre

D) Is maximum somewhere between surface and centre

Answer: C. Remains same throughout the conductor between the surface and the centre

Q: A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 kV, its kinetic energy will be:

A) 1840 keV

B) 1/1840 keV

C) 1 keV

D) 920 keV

Answer: C. 1 keV

Q: The electric flux through the surface of a sphere due to a charge q placed at its centre depends upon:

A) the radius of the sphere

B) the quantity of charge outside the sphere

C) the surface area of the sphere

D) the quantity of charge inside the sphere

Answer: D. the quantity of charge inside the sphere

Q: A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in the capacitor is:

A) 8 J

B) 16 J

C) 4×10³ J

D) 2×10³ J

Answer: A. 8 J

Q: The electric potential between two points A and B is ΔV. The work done W by the field in moving a charge q from A to B is:

A) W=-qΔV

B) W=qΔV

C) W=-qΔV

D) W=ΔV·q

Answer: B. W=qΔV

Q: Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

A) 3RΩ

B) 2R/4Ω

C) R/3Ω

D) 2R/3Ω

Answer: B. 2R/4Ω

Q: When n resistances each of value R are connected in parallel, the resultant resistance is x. When these n resistances are connected in series, total resistance is:

A) nx

B) r·nx

C) x/n

D) n²x

Answer: D. n²x

Q: Two bulbs marked 200 W-250 V and 100 W-250 V are joined in series to 250 V supply. Power consumed in circuit is:

A) 33 W

B) 67 W

C) 100 W

D) 300 W

Answer: B. 67 W

Q: Resistance of a wire is R ohms. The wire is stretched to double its length, then its resistance in ohms is:

A) R/2

B) 4R

C) 2R

D) R/4

Answer: C. 2R

Q: 10⁶ electrons are moving through a wire per second. The current developed is:

A) 1.6×10⁻¹⁹ A

B) 1 A

C) 1.6×10⁻¹³ A

D) 10⁶ A

Answer: C. 1.6×10⁻¹³ A

Q: A wire of uniform cross-section A and length L and resistance R is cut into two equal parts. The resistivity of each part will be:

A) doubled

B) halved

C) remains the same

D) one fourth

Answer: C. remains the same

Q: When a wire is stretched and its radius becomes R/2, then its resistance will be:

A) 16R

B) 4R

C) 2R

D) 0

Answer: A. 16R

Q: How much voltage is required to make 2A flow through a resistance of 8 Ω?

A) 16AΩ⁻¹

B) 16ΩA⁻¹

C) 16AΩ

D) A⁻¹Ω⁻¹

Answer: C. 16AΩ

Q: The powers of two electric bulbs are 100 W and 200 W. Which are connected to a power supply of 220 V. The ratio of resistance of their filament will be:

A) 1:2

B) 2:1

C) 1:3

D) 4:3

Answer: B. 2:1

Q: Thermocouple is an arrangement of two different metals to:

A) convert heat energy into electrical energy

B) produce more heat

C) convert heat energy into chemical energy

D) convert electric energy into heat energy

Answer: A. convert heat energy into electrical energy

Q: In order to achieve high accuracy, the slide of a potentiometer wire should be:

A) as long as possible

B) as short as possible

C) very thin

D) very thick

Answer: A. as long as possible