XII PHYSICS ISC
Quiz by Rajalakshmi Valsan
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- Q1
The specific resistance of a conductorincreases with :
decreasein length
decrease in cross-sectional area
increasein cross-sectional area
increasein temperature
30s - Q2
In an experiment with potentiometer, null point with a cell isfound at 240 cm. When the cell is shunted with a resistance 2 Ω, the null pointbecomes 120 cm internal resistance of cell is :
2 Ω
1 Ω
1/2Ω
4 Ω
30s - Q3
An electric heating element consumes 500 W, when connected to a100 V line. If the line voltage becomes 150 V, the power consumed Will be:
1000 W
1125 W
500 W
750W
30s - Q4
Potentiometer measures the potentialdifference more accurately than a voltmeter because:
It has a wire of high resistance
It does not draw current from externalcircuit
It has a wire of low resistance
It draws heavy current from external circuit
30s - Q5
The SI unit ofmobility is
m2V1s-1
V ms-1
m s-1
m2V-1s-1
30s - Q6
Theresistance of a tungsten filament at 150° C is 133 ohm. What will beits resistance at 500°? The temperature coefficient of resistance istungsten is 0.0045per°C.
258 ohm
445ohm
238ohm
350 ohm
30s - Q7
Thedrift velocity of free electrons in a conducting wire carrying a current is v.If the wire of same material but double of its radius the current is now 2i,then the drift velocity of electrons will be
v/2
v/4
4v
v
30s - Q8
The electriccurrent in electrolytes is due to the flow of
positive and negative charges
electrons and positive ions
electrons
positive ions only
30s - Q9
A10 V battery of negligible internal resistance is charged by 120V d.c. supply.If the resistance in the circuit is 22 ohm, the value of charging current is:
5A
10A
2.2 A
12 A
30s - Q10
Which of thefollowing statement is correct for Kirchhoff’s laws ?
It is a special lawwhich can be applied only to few circuits
It is applied to only alternating current
It is applied to both direct and alternating current
It is applied toonly direct current
30s - Q11
Themaximum power drawn out of the cell (with emf E and internal resistance r )froma source is given by
E2/3r
E2/2r
E2/r
E2/4r
30s - Q12
Thevariation of potential difference V with length l in case of two potentiometersA and B is shown in graph below. Choose the correct statement.
is preferred over B because it has smaller potentialgradient and hence more sensitive
is preferred overA because it has higher potential gradient and hence more sensitive
is preferred over A because it hassmaller potential gradient and hence more sensitive
Both A and B have same potential gradient.
30s - Q13
Which of thefollowing statements are not correct for non-ohmic resistors?
V-I relationshipis non linear.
V-I relationship is unique.
V-I relationship depends on the sign of V for thesame absolute value of V,
The straight line V-I graph does not pass through origin.
30s - Q14
Which of thefollowing instrument is simplest practical application of Wheatstone bridge?
Meter Bridge
Potentiometer
Ammeter
Galvanometer
30s - Q15
ABis a wire of potentiometer with the increase in the value of resistance R, theshift in the balance point J will be
firsttowards B then back towards A
remains constant
towards B
towardsA
30s
