CBSE Class 10 Physics Electricity Assignment Set C

Answer : C

Question. Specific resistance is numerically equal to the resistance offered by 
(a) 1 cm length of a conductor
(b) a conductor of unit cross-section
(c) 1 cm length of conductor of 1 cm² of crosssection
(d) 1 cm3 of a conductor

Answer : C

Question. 1 volt = .............. 
(a) 1 joule / coulomb
(b) 1 coulomb/joule
(c) 1 joule/coulomb²
(d) 1 joule coulomb

Answer : A

Question. In the given circuit voltmeter shows a reading of 4 V, then the power developed across R resistance will be 
(a) 15 mW
(b) 14 mW
(c) 12 mW
(d) 10 mW

Answer : A

Question. If current through a resistance is increased by 100%, simultaneously reducing resistance value to 25%, the new power dissipated will be 

(a) same
(b) increased by 100%
(c) decreased by 400%
(d) increased by 400%.

Answer : C

Question. The amount of heat produced in a conductor is 
(a) directly proportional to the current flowing through it
(b) inversely proportional to the current flowing through it
(c) directly proportional to the square of the current flowing through it
(d) inversely proportional to the square of current flowing through it.

Answer : C

Question. A multimeter is used to measure 
(a) current only
(b) resistance only
(c) voltage only
(d) current, resistance and voltage.

Answer : D

Question. The proper representation of series combination of cells obtaining maximum potential is 

Answer : A

Question. The V-I graph of resistor is shown in figure. If the resistance is determined at points A, B and C, then it is found that 

(a) resistances at A, B and C a are equal
(b) resistance at C is more than that at B
(c) resistance at B is lower than that at A.
(d) resistance at C is lower than that at A.

Answer : B

Question. Suppose five resistances, each of 10 ohm, are provided to you. You are free to get the desired value by combining them. The desired value will lie in between 
(a) 2 ohm to 50 ohm
(b) 20 ohm to 40 ohm
(c) 12 ohm to 50 ohm
(d) 10 ohm to 60 ohm

Answer : A

Question. In the following circuits, heat produced in the resistor or combination of resistors connected to a 12 V battery will be 



(a) same in all the cases
(b) minimum in case (i)
(c) maximum in case (ii)
(d) maximum in case (iii)

Answer : D

Question. Masses of three wires of copper are in the ratio 1 : 3 : 5 and their lengths are in the ratio of 5 : 3 : 1. The ratio of their electrical resistances are 
(a) 1 : 3 : 5
(b) 5 : 3 : 1
(c) 1 : 15 : 125
(d) 125 : 15 : 1

Answer : D

Question. If a wire of resistance R is melted and recast to half its length, the new resistance of the wire will be 
(a) R/4
(b) R/2
(c) R
(d) 2R

Answer : A

Question. The given figure shows the I-V curve (i) for a nichrome wire of given length and cross-section. Which of the following will yield the curve (ii)? 

(a) Increase the length of nichrome wire.
(b) Decrease the thickness of nichrome wire.
(c) Replace the nichrome wire with a similar copper wire.
(d) Replace the nichrome wire with a similar silicon wire.

Answer : C

Question. In a metallic conductor, electric current thought to be due to the movement of 
(a) ions
(b) amperes
(c) electrons
(d) protons

Answer : C

Question. In order to distribute a high potential, we connect a number of resistors 
(a) in series
(b) in parallel
(c) some in series and some in parallel
(d) It is not possible to distribute potential.

Answer : A

Answer :   When we connect rheostat, key, battery of two cells and two resistors of three ohm each then required circuit diagram will be:

Short Answers