Important MCQ's 2020
a) rg/cos thita
b) rg/L
c) g/L
d)rg/L cos thita
2)A satellite in a circular orbit around the earth has a total energy E (E < O) . It's potential energy is
a) -2E
b) -E
c) E
d) 2E
3) The moment of inertia of a solid sphere of mass M and diameter d about an arbitrary axis a distance D from the centre of the sphere is
a)mD^2 [1+0.1 (d/D)^2]
b)mD^2 [1+0.4 (d/D)^2]
c)mD^2 [1+0.1 (D/d)^2]
d)mD^2 [1+0.4 (D/d)^2] ।
4) The maximum speed and maximum acceleration of a particle executing SHM are 2 m/s and pya /2 m/s^2. The time period of the motion is
a) 8s
b) 7s
c) 4s
d) 7/pya s
5) If a wire made of a brittle metal is stretched beyond the proportional limit but within the elastic limit, then
a) the strain is plastic.
b) the strain is elastic and is linearly proportional to the stress.
c) it may break.
d)the strain is elastic but Hookes law is not obeyed.
6) The excess pressure inside a soap bubble is four times another bubble formed with the same soap solution. The ratio of the volume of the second bubble to that of the first is
a) 1:64
b) 64:1
c) 1:4
d) 4:1
7) A tunning fork gives 1 beat in 2 seconds with a tunning fork of frequency 341.3 Hz . If the beat frequency decreases when the first fork is filled a little, it's original frequency was
a) 336.8 Hz
b) 340.8 Hz
c) 341.3 Hz
d) 338.3 Hz
8) The complex tone of a sound from a musical instrument contains the fundamental of a frequency not and the odd harmonics as a overtones. The second overtones is
a) the second harmonic
b) the third harmonic
c) the fourth ammonia
d) the fifth harmonic
9) The amount of energy radiated per second by a body does not depend upon
a) area of a surface
b) mass of the body
c) nature of a surface
d) temperature difference of a surface and surroundings
10) A narrow beam of light in air strikes the surface of a glass slab (n=3/2 for glass ) such that the reflected and the refracted rays are mutually perpendicular. The polarising angle is
a) tan^-1 1.5
b) sin^-1 1.5
c) tan^-1 2/3
d) sin^-12/3
11) High magnifying power microscope have oil immersion objectives
a) to decrease the wavelength of light
b) to increase the fringe width
c) to increased the numerical aperture of the objective
d) because oil doesn't dammage the observed sample
12) The high potential difference produced by van de Graaff generator is used to
a) charge a conducting sphere to verify Gauss's law
b) set up high velocity electric wind
c) charge capacitor
d) produce high energy ion beams in a particle accelerator
13) The S.I unit of potential gradient is
a) V cm
b) V/ cm
c) V m
d) V/m
14) When a current is passed through a suspended moving coil galvanometer, the deflation of the coil is arrested by
a) the elastic torsion of the suspension fibre
b) the elastic winding of the helical spring
c) the friction at the point of suspension
d) the changing magnetic flux
15) A thin, small glass rod is suspended between the poles of a strong electromagnet . The rod
a) is strongly repelled by the magnetic field
b) is weakly attracted by the magneticfield
c) orients itself perpendicular to the magnetic field
d) orients itself parallel to the magnetic field
16) The concept of displacement current was introduced by
a) Joseph Henry
b) James clerk Maxwell
c) Michel Faraday
d) André Marie Ampère
17) The momentum of a photon with lambda=3315 Å is
a) 2×10^-27 kgm/s
b) 2×10^-41 kgm/s
c) 5×10^-27 kgm/s
d) 5×10^-41 kgm/s
18) The angular momenta of the electron in successive Bohr orbits differ by
a) nh/2 py
b) h
c) (n-1)h/2 py
d) h/2 py
19) The acronym LED stands for
a) low energy dynamo
b) light emitting diode
c) low energy device
d) light energized diode
20) amplitude modulation is employed in the frequency range (s)
a) very high frequency (VHF) and ultra high frequency (UHF)
b) very high frequency (VHF)
c) medium frequency (MF) and high frequency (HF)
d) medium frequency (MF)
https://allfactcrations.blogspot.com/2020/02/imp-questions-for-physics-hsc-board.html
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