NEW
Font size
WorksheetsTERM 1 SAMPLE 1
Total questions: 25
Worksheet time: 13mins
A charge particle is placed between the plates of a charged parallel plate capacitor. It experiences a force F. If one of the plates is removed, the force on the charge particle becomes
zero
F
2F
F/2
Two electrons of charge ‘e’ each move in the same circular path of radius ‘r’ with a constant speed ‘v’ each. The magnetic moment associated with the motion of these electrons is
evr
ev
evr/2
v4π2r3e
Two particles of masses m1 and m2 have equal charges. They are accelerated from rest through a potential difference V and then enter in a region of uniform magnetic field B . If they describe circular paths of radii r1 and r2 , respectively, then the value of m1 / m2 is
(r1r2)2
(r2r1)2
B r2r1V
B r22V r12
The I – V characteristics of two wires X and Y at constant temperatures are shown in the figure. The two wires have equal lengths and diameters. Which of them is made up of material of larger resistivity
X
Y
X and Y have same resistivity
Insufficient data
Write the dimensions of self-inductance of a coil.
ML2 T−2A−2
M2LT−2A−2
ML2T2A−2
ML2T−2A2
One metallic sphere A is given positive charge whereas another identical metallic
sphere B of exactly same mass as of A is given equal amount of negative charge.
Then:
mass of A and mass of B still remain equal
mass of B increases
mass of B decreases
mass of A increases
A metallic sphere is placed in a uniform
electric field. The line of force follows the
path(s) shown in the figure as:
1
2
3
4
For a point charge, the graph between electric field versus distance is given by : -
a
b
c
d
Equipotential surfaces
(a) are closer in regions of large electric fields compared to regions of lower electric
fields.
both (a) and (b) are correct.
(b) will be more crowded near sharp edges of a conductor.
(c) will always be equally spaced.
A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10V. The potential at the centre of the sphere is
0 V
10 V
Same as at point 5 cm away from the surface
infinity
Unit of Electric flux is ......(a)........ and it is a .......(b) .......
(a) V m-1
(b) vector
(a) V m-1
(b) scalar
(a) V m
(b) vector
(a) V m
(b) scalar
In a charged capacitor the energy is stored in
the edges of the capacitor plates
the electric field between the plates
both in positive and negative charges
positive charges
Kirchhoff’s II law for the electric network is based on:
Law of conservation of charge
Law of conservation of angular momentum
Law of conservation of energy
Law of conservation of mass
Mobility of charge carriers varies with the intensity of electric field as per the relation
mobility is directly proportional to electric field
mobility is inversely proportional to electric field
mobility is independent of electric field
mobility is directly proportional to electric field for +ve charges & inversely proportional to -ve charges
Sensitivity of potentiometer can be increased by
increasing the e.m.f of the cell
None of these
decreasing the length of the potentiometer wire
increasing the length of the potentiometer
Four devices are constructed from identical galvanometers. Which device will have the least resistance ?
Voltmeter of range 10 V
Ammeter of range 1A
Ammeter of range 10 A
Voltmeter of range 1 V
A proton and an alpha particle enter in a uniform magnetic field with the same velocity. The period of rotation of the α-particle will be:
same as that of the proton.
two times that of the proton.
three times that of the proton
four times that of the proton.
The nature of parallel and anti-parallel currents are
a
both currents repel.
both currents attract.
parallel currents attract and antiparallel currents repel.
parallel currents repel and antiparallel currents attract.
A charged particle moving with velocity v in X direction is subjected to a magnetic field B in negative X direction. As a result, the charge will
start moving in a circular path in YZ plane
move in a helical path around X-axis
remains unaffected
retard along X-axis
A metal plate can be heated by
(b) placing in a time varying magnetic field.
(a) passing either a direct or alternating current through the plate.
both (a) and (b) are correct.
(c) placing in a space varying magnetic field, but does not vary with time.
When current in a coil change from 5 A to 2 A in 0.1 s, average voltage of 50V is
produced. The self-inductance of the coil is
6H
3H
0.67H
1.67H
The expression for the induced e.m.f. contains a negative sign e = -dΦ/dt. What is the significance of the negative sign?
None of the above.
The induced e.m.f. is produced only when the magnetic flux decreases.
The induced e.m.f. is opposite to the direction of the flux.
The induced e.m.f. opposes the change in the magnetic flux.
The correct variation of capacitive reactance of a capacitor with frequency is
represented by
It is independent of frequency
A capacitor of capacitance 10-4/π F, an inductor of inductance 2/ π H and a resistor of resistance 100 Ω are connected to form a series RLC circuit. When an AC supply of 220 V, 50 Hz is applied to the circuit, determine the impedance of the circuit
14.14 ohm
100 ohm
200 ohm
141.4 ohm
The potential difference applied across a given conductor is doubled. The mobility of the electrons in the conductor
is doubled.
becomes four times.
remains unchanged.
is halved.
