Free MCQs & Online Quiz Practice for Exams

Q: An electron has charge −e and mass m. A proton has charge +e and mass 1840 m. A 'proton volt' is equal to: (Entry test 2016)

A) 1 eV

B) 1840 eV

C) 1/1840 eV

D) 1840 eV

Q: Starting from rest, a proton and an α-particle are accelerated through the same potential difference. The ratio of their final speeds V_p / V_α is: (Entry test 2015)

A) 1/2

B) 1

C) √2

D) 2

Q: The force on an electron in an electric field of 10⁹ N/C is approximately: (Entry test 2014)

A) 1.6×10¹ N

B) 1.6×10⁻⁹ N

C) 1.6×10⁻¹⁰ N

D) 1.6×10⁻¹⁰ N

Q: Which of the following is the same unit as the farad? (Entry test 2014)

A) s²·A²·kg⁻¹·m⁻²

B) Q·s⁻¹

C) Q·s

D) Q·s⁻²

Q: Metals are good conductors of electricity because they contain: (Entry test 2010)

A) Large number of free electrons

B) Small number of free electrons

C) Large number of bound electrons

D) Small number of bound electrons

Q: The potential gradient between two charged plates separated by 0.5 cm with potential difference 12 V is: (Entry test 2011)

A) 24 N/C

B) 2.4 N/C

C) 240 N/C

D) 2400 N/C

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

A) Volt/m

B) Newton/Coulomb

C) Joule/Coulomb·m

D) All of these

Q: A 100 m long conductor carrying 2 A is at right angles to a magnetic field of 5 Wb/m². The force experienced by the conductor is approximately: (Entry test 2009)

A) 1.2 N

B) 3 dynes

C) 10⁷ dynes

D) 10 dynes

Q: An electric current of 1 A passes for 1 second. How many electrons flow? (e = 1.6×10⁻¹⁹ C) (Entry test 2012)

A) 3.21×10¹⁸

B) 2.2×10¹⁸

C) 1.6×10¹⁹

D) 6.25×10¹⁸

Q: According to Millikan's oil drop experiment the charge on an oil droplet is: (Entry test 2012)

A) Quantized

B) Integral multiple of e

C) Not less than e

D) All of the above

Q: Three identical capacitors (C μF each) are connected in series to a 6 V supply. The voltage across each capacitor is: (Entry test 2006)

A) 6 V

B) 1 V

C) 3 V

D) 2 V

Q: In house circuits all electric appliances are connected in parallel between the main line and neutral line. Appliances will have: (Entry test 2010)

A) Same current

B) Same power

C) Different potential difference

D) Same potential difference

Q: A total charge of 100 C flows through a 12 W bulb in time of 50 s. What is the potential difference across the bulb during this time? (Entry test 2016)

A) 0.12 V

B) 2.0 V

C) 6.0 V

D) 24 V

Q: Which type of field is present near a moving electric charge? (Entry test 2009)

A) An electric field only

B) A magnetic field only

C) Both electric & magnetic fields

D) Magnetic & gravitational fields

Q: If two bulbs of 25 W and 100 W, each rated at 220 V, are connected in series to a 440 V supply, which bulb will fuse? (Entry test 2016)

A) 100 W bulb

B) 25 W bulb

C) Both

D) None

Q: A wire of uniform cross section A, length L and resistance R is cut into two equal pieces. The resistivity of each piece will be: (Entry test 2011)

A) The same

B) One fourth

C) Doubled

D) One half

Q: A current of 20.0 A flows through a battery with emf 6.20 V. If the internal resistance is 0.0012 Ω, what is the terminal voltage? (Entry test 2014)

A) 6.40 V

B) 31.0 V

C) 1.24 V

D) 6.00 V

Q: Four 20 Ω resistors are connected in parallel and the combination is connected to an emf device. The current in the device is: (Entry test 2015)

A) 0.25 A

B) 1.0 A

C) 4.0 A

D) 5.0 A

Q: A charged soap bubble's size will: (Entry test 2012)

A) Decrease

B) Increase

C) No change

D) None

Q: Three equal resistors that have equivalent resistance R/3 when in parallel, when connected in series their equivalent resistance is: (Entry test 2012)

A) R/3

B) R

C) 2R

D) 3R