Physics 12 ISC
Quiz by Chetna Thakkar
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- Q1
A power transmission line feeds input power at 2300 V to a step-down transformer with its primary windings having 4000 turns. The number of turns in the secondary in order to get output power at 230 V .
400
4
4000
40
10s - Q2
We need to step-up the voltage for power transmission, so that_______
the power is increased before transmission is done
the current is reduced and consequently, the I R2loss is cut down
the voltage is decreased so V R 2/ losses are reduced
the voltage is increased, the power losses are also increased
10s - Q3
An AC generator can be converted into DC generator by__________.
connecting commutator
reducing turns of coil
removing commutator
reversing the magnetic field
10s - Q4
Given three equal resistors, how many different combinations (taken all of them together) can be made?
3
4
5
6
45s - Q5
An incandescent light bulb takes some time to heat up and produce light, whereas afluorescent tubelight instantly lightens up. Which of the following device is used to achieve fast action of tubelight?
Choke coil
Capacitor bank
Thermostat
Rheostat
10s - Q6
Mutual inductance between two magnetically coupled coils, depend on(a)
All of the above
number of turns of the coils
cross-sectional area of their common core
nature of material
10s - Q7
Which of the following is not an element of earth’s magnetic field?
Horizontal component of earth’s magnetic field
Angle of declination
Angle of dip
Angle of repose
10s - Q8
The direction of magnetic moment in a bar magnet is given by which of the following directions?
None of these
N → S
Both (a) and (b)
S → N
10s - Q9
In the equation AB = C, A is the current density, C is the electric field, Then B is_____.
conductivity
resistance
potential difference
resistivity
10s - Q10
How many different resistances are possible with two equal resistors?
4
2
3
5
10s - Q11
When a glass rod rubbed with silk is brought near the gold leaf electroscope, the leaves diverge. What is the nature of charge on the leaves?
Either positive or negative
Negative
Zero
Positive
10s - Q12
Which of the following statement is correct for equipotential surfaces for uniform electric field?
Equipotential surface is always spherical in shape.
Electric lines of force are perpendicular to equipotential surface.
Work done in moving a charge on equipotential surface is always negative.(d)
Two equipotential surfaces intersect each other at acute angles
10s - Q13
A cell of emf 1.5 V having a finite internal resistance is connected to a load resistance of2W. For maximum power transfer, the internal resistance of the cell should be___
None of these
0 5. W
4 W
2 W
10s - Q14
A potentiometer is an accurate and versatile device to make electrical measurement of emf because the method involves______.
a condition of no current flow through the galvanometer
potential gradients
a combination of cells, galvanometer and resistances
cells
10s - Q15
An electron and a-particle with equal momentum enters perpendicularly into uniform magnetic field, then___________.
path of both particles will be a straight line
path of electron will be more curved than that of a-particle(c)
path of a-particle will be more curved than that of electron
path of both particles will be equally curved
10s