Download App

Physics M.C.Q (1 Marks)

Magnetism · CBSE STD 12 Science (CBSE - English Medium). 303 questions.

Questions · Page 5 of 7

M.C.Q (1 Marks)

MCQ 2011 Mark
The angle of dip at a place is 60°. At this place the total intensity of earth's magnetic field is 0.64 units. The horizontal intensity of earth's magnetic field at this place is
  • A
    1.28 units
  • B
    0.64 units
  • C
    0.16 units
  • ✓
    0.32 units
Answer
Correct option: D.
0.32 units
 0.32 units
View full question & answer→
MCQ 2021 Mark
At a place, the horizontal and vertical intensities of earth's magnetic field is 0.30 Gauss and 0.173 Gauss respectively. The angle of dip at this place is
  • ✓
    30°
  • B
    90°
  • C
    60°
  • D
    45°
Answer
Correct option: A.
30°
 30°
View full question & answer→
MCQ 2031 Mark
A dip needle in a plane perpendicular to magnetic meridian will remain
  • ✓
    Vertical
  • B
    Horizontal
  • C
    In any direction
  • D
    At an angle of dip to the horizontal
Answer
Correct option: A.
Vertical
 Vertical
View full question & answer→
MCQ 2041 Mark
At magnetic poles of earth, angle of dip is
  • A
    $ \text { Zero } $
  • B
    $ 45^{\circ} $
  • ✓
    $ 90^{\circ} $
  • D
    $ 180^{\circ}$
Answer
Correct option: C.
$ 90^{\circ} $
$90^{\circ}$
View full question & answer→
MCQ 2051 Mark
Two identical short bar magnets, each having magnetic moment of $10 \mathrm{Am}^2$, are arranged such that their axial lines are perpendicular to each other and their centres be along the same straight line in a horizontal plane. If the distance between their centres is 0.2 m, the resultant magnetic induction at a point midway between them is $(\mu_0=4\pi \times 10^{-7} Hm^{-1})$ 
  • A
    $\sqrt 2 \times 10^{-7}$ Tesla
  • B
    $\sqrt 5 \times 10^{-7}$ Tesla
  • C
    $\sqrt 2 \times 10^{-3}$ Tesla
  • ✓
    $\sqrt 5 \times 10^{-3}$ Tesla
Answer
Correct option: D.
$\sqrt 5 \times 10^{-3}$ Tesla
(d) $\sqrt 5 \times 10^{-3}$ Tesla
View full question & answer→
MCQ 2061 Mark
A small bar magnet has a magnetic moment $1.2 A-m^2$. The magnetic field at a distance $0.1 m$ on its axis will be : $(m_0= 4p \times 10^{-7}\ T-m/A)$
  • A
    $ 1.2 \times 10^{-4} \mathrm{~T} $
  • ✓
    $ 2.4 \times 10^{-4} \mathrm{~T} $
  • C
    $ 2.4 \times 10^4 \mathrm{~T} $
  • D
    $ 1.2 \times 10^4 \mathrm{~T}$
Answer
Correct option: B.
$ 2.4 \times 10^{-4} \mathrm{~T} $
$ 2.4 \times 10^{-4} \mathrm{~T} $
View full question & answer→
MCQ 2071 Mark
The magnetic potential at a point on the axial line of a bar magnet of dipole moment M is V. What is the magnetic potential due to a bar magnet of dipole moment $\frac{M}{4}$ at the same point
  • A
    4V
  • B
    2V
  • C
    $\frac{V}{2}$
  • ✓
    $\frac{V}{4}$
Answer
Correct option: D.
$\frac{V}{4}$
(d) $\frac{V}{4}$
View full question & answer→
MCQ 2081 Mark
The effective length of a magnet is 31.4 cm and its pole strength is 0.5 Am. The magnetic moment, if it is bent in the form of a semicircle will be
  • ✓
    $0.1 $ Am$^2$
  • B
    $0.01 $ Am$^2$
  • C
    $0.2 $ Am$^2$
  • D
    $1.2 $ Am$^2$
Answer
Correct option: A.
$0.1 $ Am$^2$
(a) $0.1 $ Am$^2$
View full question & answer→
MCQ 2091 Mark
The magnetic moment of a magnet of length 10 cm and pole strength 4.0 Am will be
  • ✓
    $0.4 $ Am$^2$
  • B
    1.6 Am$^2$
  • C
    20 Am$^2$
  • D
    8.0 Am$^2$
Answer
Correct option: A.
$0.4 $ Am$^2$
(a) $0.4 $ Am$^2$
View full question & answer→
MCQ 2101 Mark
The angle between the earth's magnetic and the earth's geographical axes is
  • A
    Zero
  • ✓
    17°
  • C
    23°
  • D
    None of these
Answer
Correct option: B.
17°
 17°
View full question & answer→
MCQ 2111 Mark
The line on the earth's surface joining the points where the field is horizontal is
  • A
    Magnetic meridian
  • B
    Magnetic axis
  • C
    Magnetic line
  • ✓
    Magnetic equator
Answer
Correct option: D.
Magnetic equator
 Magnetic equator
View full question & answer→
MCQ 2131 Mark
At a certain place the angle of dip is 30° and the horizontal component of earth's magnetic field is 0.50 Oersted. The earth's total magnetic field is
  • A
    $\sqrt 3$
  • B
    1
  • ✓
    $\frac{1}{\sqrt 3}$
  • D
    $\frac{1}{2}$
Answer
Correct option: C.
$\frac{1}{\sqrt 3}$
(c) $\frac{1}{\sqrt 3}$
View full question & answer→
MCQ 2141 Mark
The angle of dip is the angle
  • A
    Between the vertical component of earth's magnetic field and magnetic meridian
  • B
    Between the vertical component of earth's magnetic field and geographical meridian
  • ✓
    Between the earth's magnetic field direction and horizontal direction
  • D
    Between the magnetic meridian and the geographical meridian
Answer
Correct option: C.
Between the earth's magnetic field direction and horizontal direction
 Between the earth's magnetic field direction and horizontal direction
View full question & answer→
MCQ 2151 Mark
The angle of dip at a place is 40.6$^\circ$ and the intensity of the vertical component of the earth's magnetic field $V = 6 \times 10^{-5} $ Tesla. The total intensity of the earth's magnetic field (I) at this place is
  • A
    $7 \times 10^{-5} $ Tesla
  • B
    $ 6 \times 10^{-5} $ Tesla
  • C
    $5 \times 10^{-5} $ Tesla
  • ✓
    $9.2 \times 10^{-5} $ Tesla
Answer
Correct option: D.
$9.2 \times 10^{-5} $ Tesla
(d) $9.2 \times 10^{-5} $ Tesla
View full question & answer→
MCQ 2161 Mark
At a place the earth's horizontal component of magnetic field is $0.36\times 10^{-4}$ weber/m$^2$. If the angle of dip at that place is 60$^\circ$, then the vertical component of earth's field at that place in weber/m$^2$ will be approximately
  • A
    $0.12\times 10^{-4}$
  • B
    $0.24 \times 10^{-4}$
  • C
    $0.40 \times 10^{-4}$ 
  • ✓
    $0.62\times 10^{-4}$ 
Answer
Correct option: D.
$0.62\times 10^{-4}$ 
(d) $0.62\times 10^{-4}$ 
View full question & answer→
MCQ 2171 Mark
If the angles of dip at two places are 30$^\circ$ and 45$^\circ$respectively, then the ratio of horizontal components of earth's magnetic field at the two places will be
  • ✓
    $\sqrt 3:\sqrt 2$
  • B
    $1: \sqrt 2$
  • C
    $1: \sqrt 3$
  • D
    1 : 2
Answer
Correct option: A.
$\sqrt 3:\sqrt 2$
(a) $\sqrt 3:\sqrt 2$
View full question & answer→
MCQ 2181 Mark
At a place, if the earth's horizontal and vertical components of magnetic fields are equal, then the angle of dip will be
  • A
    30°
  • B
    90°
  • ✓
    45°
  • D
    0°
Answer
Correct option: C.
45°
 45°
View full question & answer→
MCQ 2191 Mark
The lines of forces due to earth's horizontal component of magnetic field are
  • ✓
    Parallel straight lines
  • B
    Concentric circles
  • C
    Elliptical
  • D
    Parabolic
Answer
Correct option: A.
Parallel straight lines
 Parallel straight lines
View full question & answer→
MCQ 2201 Mark
The vertical component of earth's magnetic field is zero at or The earth's magnetic field always has a vertical component except at the
  • A
    Magnetic poles
  • B
    Geographical poles
  • C
    Every place
  • ✓
    Magnetic equator
Answer
Correct option: D.
Magnetic equator
 Magnetic equator
View full question & answer→
MCQ 2211 Mark
At a certain place, the horizontal component of earth's magnetic field is $\sqrt 3$ times the vertical component. The angle of dip at that place is
  • A
    60°
  • B
    45°
  • C
    90°
  • ✓
    30°
Answer
Correct option: D.
30°
(d) 30°
View full question & answer→
MCQ 2221 Mark
The correct relation is (Where $B_H=$ Horizontal component of earth's magnetic field; $B_V$ = Vertical component of earth's magnetic field and B = Total intensity of earth's magnetic field)
  • A
    $B=\frac{B_V}{B_H}$
  • B
    $B=B_V\times B_H$
  • ✓
    $|B| = \sqrt {{B_H}^{2}+{B_v}^{2}}$
  • D
    $B=B_H+B_V$
Answer
Correct option: C.
$|B| = \sqrt {{B_H}^{2}+{B_v}^{2}}$
(c) $|B| = \sqrt {{B_H}^{2}+{B_v}^{2}}$
View full question & answer→
MCQ 2231 Mark
A very small magnet is placed in the magnetic meridian with its south pole pointing north. The null point is obtained 20 cm away from the centre of the magnet. If the earth's magnetic field (horizontal component) at this point be 0.3 gauss, the magnetic moment of the magnet is
  • A
    $8.0 \times 10^2$ e.m.u.
  • ✓
    $1.2 \times 10^3$ e.m.u.
  • C
    $2.4 \times 10^3$ e.m.u.
  • D
    $3.6 \times 10^3$ e.m.u.
Answer
Correct option: B.
$1.2 \times 10^3$ e.m.u.
(b) $1.2 \times 10^3$ e.m.u.
View full question & answer→
MCQ 2241 Mark
Intensity of magnetic field due to earth at a point inside a hollow steel box is
  • A
    Less than outside
  • B
    More than outside
  • C
    Same
  • ✓
    Zero
Answer
Correct option: D.
Zero
  Zero
View full question & answer→
MCQ 2251 Mark
Earth's magnetic field always has a horizontal component except at or Horizontal component of earth's magnetic field remains zero at
  • A
    Equator
  • ✓
    Magnetic poles
  • C
    A latitude of $60^{\circ}$
  • D
    An altitude of $60^{\circ}$
Answer
Correct option: B.
Magnetic poles
Magnetic poles
View full question & answer→
MCQ 2261 Mark
Two like magnetic poles of strength 10 and 40 SI units are separated by a distance 30 cm. The intensity of magnetic field is zero on the line joining them
  • A
    At a point 10 cm from the stronger pole
  • ✓
    At a point 20 cm from the stronger pole
  • C
    At the mid-point
  • D
    At infinity
Answer
Correct option: B.
At a point 20 cm from the stronger pole
 At a point 20 cm from the stronger pole
View full question & answer→
MCQ 2271 Mark
Two magnets, each of magnetic moment ‘M’ are placed so as to form a cross at right angles to each other. The magnetic moment of the system will be
  • A
    2M
  • ✓
    $\sqrt{2} \mathrm{M}$
  • C
    0.5 M
  • D
    M
Answer
Correct option: B.
$\sqrt{2} \mathrm{M}$
(b) $\sqrt{2} \mathrm{M}$
View full question & answer→
MCQ 2281 Mark
A bar magnet of length 3 cm has points A and B along its axis at distances of 24 cm and 48 cm on the opposite sides. Ratio of magnetic fields at these points will be
  • ✓
    8
  • B
    $1 / 2 \sqrt{2}$
  • C
    3
  • D
    4
Answer
Correct option: A.
8
(a) 8
View full question & answer→
MCQ 2291 Mark
Magnetic dipole moment is a
  • A
    Scalar quantity
  • ✓
    Vector quantity
  • C
    Constant quantity
  • D
    None of these
Answer
Correct option: B.
Vector quantity
Vector quantity
View full question & answer→
MCQ 2301 Mark
The torque on a bar magnet due to the earth's magnetic field is maximum when the axis of the magnet is
  • ✓
    Perpendicular to the field of the earth
  • B
    Parallel to the vertical component of the earth's field
  • C
    At an angle of $33^\circ$ with respect to the $N-S$ direction
  • D
    Along the North$-$South $(N-S)$ direction
Answer
Correct option: A.
Perpendicular to the field of the earth
Perpendicular to the field of the earth
View full question & answer→
MCQ 2311 Mark
The work done in rotating a magnet of magnetic moment $2 \mathrm{~A}-\mathrm{m}^2$ in a magnetic field of $5 \times 10^{-3} \mathrm{~T}$ from the direction along the magnetic field to opposite direction to the magnetic field, is
  • A
    Zero
  • ✓
    $2 \times 10^{-2} \mathrm{~J}$
  • C
    $10^{-2} \mathrm{~J} $
  • D
    $10 \mathrm{~J}$
Answer
Correct option: B.
$2 \times 10^{-2} \mathrm{~J}$
$2 \times 10^{-2} \mathrm{~J}$
View full question & answer→
MCQ 2321 Mark
If a magnet is hanged with its magnetic axis then it stops in
  • ✓
    Magnetic meridian
  • B
    Geometric meridian
  • C
    Angle of dip
  • D
    None of these
Answer
Correct option: A.
Magnetic meridian
 Magnetic meridian
View full question & answer→
MCQ 2331 Mark
The ultimate individual unit of magnetism in any magnet is called
  • A
    North pole
  • B
    South pole
  • ✓
    Dipole
  • D
    Quadrupole
Answer
Correct option: C.
Dipole
Dipole
View full question & answer→
MCQ 2341 Mark
Two lines of force due to a bar magnet
  • A
    Intersect at the neutral point
  • B
    Intersect near the poles of the magnet
  • C
    Intersect on the equatorial axis of the magnet
  • ✓
    Do not intersect at all
Answer
Correct option: D.
Do not intersect at all
 Do not intersect at all
View full question & answer→
MCQ 2351 Mark
A bar magnet when placed at an angle of $30^{\circ}$ to the direction of magnetic field induction of $5 \times 10^{-2} \mathrm{~T}$, experiences a moment of couple $25 \times 10^{-6} \mathrm{~N}-\mathrm{m}$. If the length of the magnet is $5 \ cm$ its pole strength is
  • ✓
    $2 \times 10^{-2} \mathrm{~A}-\mathrm{m}$
  • B
    $ 5 \times 10^{-2} \mathrm{~A}-\mathrm{m}$
  • C
    $2 A-m$
  • D
    $5 \mathrm{~A}-\mathrm{m}$
Answer
Correct option: A.
$2 \times 10^{-2} \mathrm{~A}-\mathrm{m}$
$2 \times 10^{-2} \mathrm{~A}-\mathrm{m}$
View full question & answer→
MCQ 2361 Mark
A bar magnet of magnetic moment $3.0\ A-m^2$ is placed in a uniform magnetic induction field of $2 × 10^{-5}$ T. If each pole of the magnet experiences a force of $6 × 10^{-4} N$, the length of the magnet is
  • A
    $0.5 m$
  • B
    $0.3 m$
  • C
    $0.2 m$
  • ✓
    $0.1 m$
Answer
Correct option: D.
$0.1 m$
$0.1 m$
View full question & answer→
MCQ 2371 Mark
There is no couple acting when two bar magnets are placed coaxially separated by a distance because
  • A
    There are no forces on the poles
  • B
    The forces are parallel and their lines of action do not coincide
  • C
    The forces are perpendicular to each other
  • ✓
    The forces act along the same line
Answer
Correct option: D.
The forces act along the same line
 The forces act along the same line
View full question & answer→
MCQ 2381 Mark
A bar magnet is held perpendicular to a uniform magnetic field. If the couple acting on the magnet is to be halved by rotating it, then the angle by which it is to be rotated is
  • A
    $ 30^{\circ} $
  • B
    $ 45^{\circ} $
  • ✓
    $ 60^{\circ} $
  • D
    $ 90^{\circ}$
Answer
Correct option: C.
$ 60^{\circ} $
$60^{\circ}$
View full question & answer→
MCQ 2391 Mark
A magnet of magnetic moment 50 $\hat{1} \mathrm{~A}-\mathrm{m}^2$ is placed along the x-axis in a magnetic field $\vec{B}=(0.5 \hat{i}+3.0 \hat{j})$T. The torque acting on the magnet is
  • A
    175 $\hat{\mathrm{k}} \mathrm{N}-\mathrm{m}$
  • ✓
    150 $\hat{\mathrm{k}} \mathrm{N}-\mathrm{m}$
  • C
    75 $\hat{\mathrm{k}} \mathrm{N}-\mathrm{m}$
  • D
    $25 \sqrt{37} \hat{\mathrm{k}} \mathrm{N}-\mathrm{m}$
Answer
Correct option: B.
150 $\hat{\mathrm{k}} \mathrm{N}-\mathrm{m}$
(b) 150 $\hat{\mathrm{k}} \mathrm{N}-\mathrm{m}$
View full question & answer→
MCQ 2401 Mark
Two similar bar magnets P and Q, each of magnetic moment M, are taken, If P is cut along its axial line and Q is cut along its equatorial line, all the four pieces obtained have
  • A
    Equal pole strength
  • B
    Magnetic moment $\frac{\mathrm{M}}{4}$
  • ✓
    Magnetic moment $\frac{\mathrm{M}}{2}$
  • D
    Magnetic moment M
Answer
Correct option: C.
Magnetic moment $\frac{\mathrm{M}}{2}$
(c) Magnetic moment $\frac{\mathrm{M}}{2}$
View full question & answer→
MCQ 2411 Mark
A bar magnet of magnetic moment $200\ A-m^2$ is suspended in a magnetic field of intensity $0.25 N/A-m.$ The couple required to deflect it through $30^\circ$ is
  • A
    $50 N-m$
  • ✓
    $25 N-m$
  • C
    $20 N-m$
  • D
    $15 N-m$
Answer
Correct option: B.
$25 N-m$
$25 N-m$
View full question & answer→
MCQ 2421 Mark
The intensity of magnetic field is H and moment of magnet is M. The maximum potential energy is
  • ✓
    MH
  • B
    2 MH
  • C
    3 MH
  • D
    4 MH
Answer
Correct option: A.
MH
 MH
View full question & answer→
MCQ 2431 Mark
If a magnet of length $10 \ cm$ and pole strength $40 \mathrm{~A}-\mathrm{m}$ is placed at an angle of $45^{\circ}$ in an uniform induction field of intensity $2 \times 10^{-4} \mathrm{~T}$, the couple acting on it is
  • A
    $ 0.5656 \times 10^{-4} \mathrm{~N}-\mathrm{m} $
  • ✓
    $ 0.5656 \times 10^{-3} \mathrm{~N}-\mathrm{m} $
  • C
    $ 0.656 \times 10^{-4} \mathrm{~N}-\mathrm{m} $
  • D
    $ 0.656 \times 10^{-5} \mathrm{~N}-\mathrm{m}$
Answer
Correct option: B.
$ 0.5656 \times 10^{-3} \mathrm{~N}-\mathrm{m} $
$ 0.5656 \times 10^{-3} \mathrm{~N}-\mathrm{m} $
View full question & answer→
MCQ 2441 Mark
The direction of line of magnetic field of bar magnet is
  • A
    From south pole to north pole
  • B
    From north pole to south pole
  • C
    Across the bar magnet
  • ✓
    From south pole to north pole inside the magnet and from north pole to south pole outside the magnet
Answer
Correct option: D.
From south pole to north pole inside the magnet and from north pole to south pole outside the magnet
 From south pole to north pole inside the magnet and from north pole to south pole outside the magnet
View full question & answer→
MCQ 2451 Mark
A magnet of magnetic moment M is rotated through 360° in a magnetic field H, the work done will be
  • A
    MH
  • B
    2MH
  • C
    2πMH
  • ✓
    Zero
Answer
Correct option: D.
Zero
 Zero
View full question & answer→
MCQ 2461 Mark
Rate of change of torque τ with deflection θ is maximum for a magnet suspended freely in a uniform magnetic field of induction B, when
  • ✓
    θ = 0°
  • B
    θ = 45°
  • C
    θ = 60°
  • D
    θ = 90°
Answer
Correct option: A.
θ = 0°
 θ = 0°
View full question & answer→
MCQ 2471 Mark
Magnetic lines of force
  • A
    Always intersect
  • ✓
    Are always closed
  • C
    Tend to crowd far away from the poles of magnet
  • D
    Do not pass through vacuum
Answer
Correct option: B.
Are always closed
 Are always closed
View full question & answer→
MCQ 2481 Mark
If a hole is made at the centre of a bar magnet, then its magnetic moment will
  • A
    Increase
  • B
    Decrease
  • ✓
    Not change
  • D
    None of these
Answer
Correct option: C.
Not change
 Not change
View full question & answer→
MCQ 2501 Mark
A magnet of magnetic moment $2 \mathrm{JT}^{-1}$ is aligned in the direction of magnetic field of 0.1 T. What is the net work done to bring the magnet normal to the magnetic field
  • A
    0.1 J
  • ✓
    0.2 J
  • C
    1 J
  • D
    2 J
Answer
Correct option: B.
0.2 J
(b) 0.2 J
View full question & answer→
Generate Paper FreeAll Magnetism topics