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Physics M.C.Q (1 Marks)

REPEATER 2024 · Maharashtra Board STD 12 Science (MSBSHSE - English Medium). 10 questions.

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M.C.Q (1 Marks)

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10 questions · timed · auto-graded

MCQ 11 Mark
When an air column in a pipe closed at one end vibrates such that two nodes are formed in it, the frequency of its vibration is_________.
  • A
    two times the fundamental frequency
  • ✓
    three times the fundamental frequency
  • C
    four times the fundamental frequency
  • D
    five times the fundamental frequency
Answer
Correct option: B.
three times the fundamental frequency
(b) three times the fundamental frequency
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MCQ 21 Mark
In a serics LCR circuit the phase difference between the voltage and the current is 45". Then the power factor will be _________.
  • A
    0.6071
  • ✓
    0.7071
  • C
    0.8081
  • D
    1.0
Answer
Correct option: B.
0.7071
(b) 0.7071
Explanation: Power factor $=\cos (\phi)=\cos \left(45^{\circ}\right)=0.7071$
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MCQ 31 Mark
The ratio of emissive power of a perfect black body at $927^{\circ} C$ and $327^{\circ} C$ is _________.
  • A
    2:1
  • B
    4:1
  • C
    8:1
  • D
    16:1
Answer
16:1
Explanation: $T_1=927+273=1200 K, \quad T_2=327+273=600 K$
$E \propto T^4 \quad$ (Stefan-Boltzmann law)
$\therefore \quad \frac{E_1}{E_2}=\left(\frac{T_1}{T_2}\right)^4=\left(\frac{1200}{600}\right)^4=\left(\frac{2}{1}\right)^4=\frac{16}{1}$
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MCQ 41 Mark
The unit henry is equal to $............$
  • A
    watt
  • ✓
    ohm$-$second
  • C
    dyne
  • D
    $Wb/m^2$
Answer
Correct option: B.
ohm$-$second
ohm$-$second
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MCQ 51 Mark
Cyclotron is used to accelerate_________.
  • A
    neutral particles
  • B
    negatively charged particles
  • ✓
    positively charged particles
  • D
    all types of particles
Answer
Correct option: C.
positively charged particles
(c) positively charged particles
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MCQ 61 Mark
An electron, a proton, an  ∝-particle and a hydrogen atom are moving with the same kinetic energy. The associated de Broglie wavelength will be the longest for __________
  • ✓
    electron
  • B
    proton
  • C
    $\propto$-particle
  • D
    hydrogen atom
Answer
Correct option: A.
electron
(a) electron
Explanation: $\lambda=\frac{h}{\sqrt{2 m E_k}}$
$\therefore \quad$ The one with the smallest mass will have the longest de Broglie wavelength.
Since the electron has the smallest mass compared to the proton, a-particle, and hydrogen atom, the de Broglie wavelength will be the longest for the electron
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MCQ 71 Mark
An LED emits light when its __________
  • A
    junction is reverse biased
  • B
    depletion region widens
  • ✓
    holes and electrons recombine
  • D
    junction becomes hot
Answer
Correct option: C.
holes and electrons recombine
(c) holes and electrons recombine
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MCQ 81 Mark
If coefficient of emission is 'e' for a perfectly black body and coefficient of transmission is 't' then __________
  • A
    e = 0, t = 1
  • B
    e = 1, t = 1
  • C
    e = 0, t = 0
  • ✓
    e = 1, t = 0
Answer
Correct option: D.
e = 1, t = 0
(d) e = 1, t = 0
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MCQ 91 Mark
The molecules on the surface of liquid have __________
  • A
    minimum kinetic energy
  • B
    minimum potential energy
  • C
    maximum kinetic energy
  • ✓
    maximum potential energy
Answer
Correct option: D.
maximum potential energy
(d) maximum potential energy
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MCQ 101 Mark
Atoms having the same number of protons but different number of neutrons are called __________
  • ✓
    isotopes
  • B
    isobars
  • C
    isotones
  • D
    isomers
Answer
Correct option: A.
isotopes
(a) isotopes
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