M.C.Q (1 Marks)

MCQ 11 Mark

In biprism experiment, the distance of 20th bright band from the central bright band is 1.2 cm. Without changing the experimental set-up, the distance of 30 bright band from the central bright band will be ______.

A
0.6 cm
B
0.8 cm
C
1.2 cm
D
1.8 cm

Answer

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MCQ 21 Mark

The velocity of bob of a second’s pendulum when it is 6 cm from its mean position and amplitude of 10 cm, is ______.

A
$8 \pi cm / s$
B
$6 \pi cm / s$
C
$4 \pi cm / s$
D
$2 \pi cm / s$

Answer

The velocity of bob of a second’s pendulum when it is 6 cm from its mean position and amplitude of 10 cm, is $8 \pi cm / s$

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MCQ 31 Mark

The current in a coil changes from 50A to 10A in 0.1 second. The self inductance of the coil is 20H. The induced e.m.f. in the coil is ______.

A
800V
B
6000V
C
7000V
D
8000V

Answer

The current in a coil changes from 50A to 10A in 0.1 second. The self inductance of the coil is 20H. The induced e.m.f. in the coil is 8000V

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MCQ 41 Mark

In a cyclic process, if $\triangle U=$ internal energy, $W=$ work done, $Q=$ Heat supplied then ______.

A
$\triangle U=Q$
B
$Q =0$
C
$W=0$
D
$W = Q$

Answer

In a cyclic process, if $\triangle U=$ internal energy, $W=$ work done, $Q=$ Heat supplied then $W = Q$

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MCQ 51 Mark

If the frequency of incident light falling on a photosensitive material is doubled, then the kinetic energy of the emitted photoelectron will be $........$

A
same as its initial value
B
two times its initial value
✓
more than two times its initial value
D
less than two times its initial value

Answer

Correct option: C.

more than two times its initial value

If the frequency of incident light falling on a photosensitive material is doubled, then the kinetic energy of the emitted photoelectron will be more than two times its initial value.
$E=W_0+K_{\max }$
$\Rightarrow K_{\max }=E-W_0=h \nu-W_0$
$\Rightarrow K_1=h \nu-W_0$ and $K_2=2 h \nu-W_0$
$\Rightarrow K_2>2 K_1$

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MCQ 61 Mark

To convert a moving coil galvanometer into an ammeter we need to connect a ______.

A
small resistance in parallel with it
B
large resistance in series with it
C
small resistance in series with it
D
large resistance in parallel with it

Answer

To convert a moving coil galvanometer into an ammeter we need to connect a small resistance in parallel with it.

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MCQ 71 Mark

The work done in bringing a unit positive charge from infinity to a given point against the direction of electric field is known as ______.

A
electric flux
B
magnetic potential
C
electric potential
D
gravitational potential

Answer

The work done in bringing a unit positive charge from infinity to a given point against the direction of electric field is known as electric potential

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MCQ 81 Mark

Phase difference between a node and an adjacent antinode in a stationary wave is ______.

A
$\frac{\pi}{2}$
B
$\frac{\pi}{2} rad$
C
$\frac{3 \pi}{4} rad$
D
$\pi rad$

Answer

Phase difference between a node and an adjacent antinode in a stationary wave is $\frac{\pi}{2} rad$.

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MCQ 91 Mark

The dimensional formula of surface tension is ______.

A
$\left[L^{-1} M^1 T^{-2}\right]$
B
$\left[L^2 M^1 T^{-2}\right]$
C
$\left[L^1 M^1 T^{-1}\right]$
D
$\left[L^0 M^1 T^{-2}\right]$

Answer

The dimensional formula of surface tension is $\left[L^0 M^1 T^{-2}\right]$.

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MCQ 101 Mark

The moment of inertia $(MI)$ of a disc of radius $R$ and mass $M$ about its central axis is $...........$

A
$\frac{ MR ^2}{4}$
✓
$\frac{ MR ^2}{2}$
C
$MR^2$
D
$\frac{3 MR ^2}{2}$

Answer

Correct option: B.

$\frac{ MR ^2}{2}$

The moment of inertia $(MI)$ of a disc of radius $R$ and mass $M$ about its central axis is $\frac{ MR ^2}{2}$ .

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Physics M.C.Q (1 Marks)

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