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1. |
Which is the only vector quantity out of the following?
(a) Electrostatic potential
(b) Moment of a spinning body
(c) Current flowing in a metal
(d) Charge of a gold leaf electroscope
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 : B |
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2. |
If the wavelength of
incident light changes from 400 nm to 300 nm, the stopping potential for
photoelectrons emitted from a surface becomes approximately
(a) 1.0 volt greater
(b) 1.0 volt smaller
(c) 0.5
volt greater
(d) 0.5 volt smaller
(e) 0.1 volt greater
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| : A |
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3. |
Sound is propagated in air as
(a) Stationary waves
(b) Longitudinal waves
(c)
Transverse waves
(d) Standing waves
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| : B |
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4. |
Surface tension of
water is 0.072 Nm−1. The excess pressure inside a water drop of diameter 1.2 mm
is
(a) 0.086 Nm−2
(b) 240 Nm−2
(c) 120 Nm−2
(d) 72 Nm−2
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| : B |
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5. |
Two radioactive
nuclides x and y have half lives 1 hour and 2 hours respectively. Initially the
samples have equal number of nuclei. After 4 hours the ratio of the numbers of x
and y is
(a) 1/2
(b) 2
(c) 1/4
(d) 1
(e) 1/16
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| : C |
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6. |
Frequency of
characteristic X-rays depends on
(a) atomic number of target
(b) mass number of
target
(c) accelerating p.d applied
(d) kinetic energy of electron
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| : A |
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7. |
In Young's double
slit experiment, the width of one of the slits is lowly increased to make it
twice the width of the other slit. Then in the interference pattern
(a) the intensity of maxima increase while that of minima decrease
(b) the
intensities of both maxima and minima decrease (c) the intensities of both
maxima and minima remain the same
(d) the intensity of maxima and decrease while
that of minima increase
(e) the intensities of both maxima
and minima increase
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| : E |
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8. |
Energy in the Sun is
generated mainly by
(a) Fusion of hydrogen atoms
(b) Chemical reaction
(c) Fission of helium atoms
(d) Fusion of radioactive material
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| : A |
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9. |
The meniscus of mercury in a glass tube is
(a) concave
(b) plane
(c) convex
(d) horizontal
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| : C |
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10. |
In the
electromagnetic spectrum, the visible spectrum lies between
(a) radio waves and microwaves
(b) infra red and
ultraviolet rays
(c) micro waves and infra red spectrum
(d) X- ray and
gamma ray spectrum
(e) ultraviolet and X ray spectrum
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| : B |
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11. |
Let the potential
energy of electron in hydrogen atom in the ground state be regarded as zero.
Then its potential energy in the first excited state will be
(a) 20.4 eV
(b) 13.6 eV
(c) 3.4 eV
(d) 6.8 eV
(e)
10.2 eV
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| : A |
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12. |
If the sun becomes
twice as hot
(a) the output of radiated energy will be eight times larger
(b) it will radiate
predominantly in the infrared
(c) it will radiate
predominantly in the ultraviolet
(d) the output of the radiated energy
will be eight times smaller
(e) the frequency spectrum of the radiated energy
will not alter
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| : C |
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13. |
What enables the aeroplane to rise in air?
(a) The lifting capacity of a downward jet of air
(b) The lifting capacity of an
upward jet of air
(c) The low pressure above the wings
(d) The high pressure above the wings
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| : C |
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14. |
Image formed by a
convex lens is virtual and erect when the object is placed
(a) at F
(b) between F and the lens
(c) at 2F
(d)
beyond 2F
(e) at infinity
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| : B |
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15. |
A body is projected
so as to have a maximum range of 80m. The wrong statement about this motion
is/are
(a) its angle of projection is 450
(b) its vertical height is 20m
(c) its energy is zero at the highest point
(d) its
path is a parabola
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| : C |
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16. |
A thin circular brass
disc has a concentric hole through it so as to make it a washer. It is then
heated. Owing to expansion of metal, the diameter of the hole will:
(a) decrease
(b) increase
(c) remain the same
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| : B |
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17. |
Hydrogen has
(a) One isotope
(b) Two isotopes
(c) Three isotopes
(d) None of the above
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| : C |
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18. |
Two coherent sources
whose intensity ratio is 81:1 produce interference fringes. The ratio of minimum
to maximum intensity i.e: Imin : Imax is
(a) 16.25
(b) 9:1
(c) 1:9
(d) 25:16
(d) 5:4
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| : A |
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19. |
A plate has a length
5.00 ± 0.10cm and breadth 2.00 ± 0.01 cm. Then the area of the plate is
(a) 10 ± 0.1 cm2
(b) 10.0 ± 0.01 cm2
(c) 10.0 ± 0.25 cm2
(d) 10.0 ± 0.2 cm2
(e) 10 cm2
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| : D |
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20. |
A lump of ice floats in water in a beaker. When all the
ice melts, the level of water in the beaker will
(a) go down
(b) change
(c) rise
(d) remain unchanged
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| : D |
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21. |
The apparent change in frequency due to relative motion
between source of sound and a listener is called
(a) Doppler effect
(b) Diffraction
(c) Resonance
(d) Beat phenomenon
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| : A |
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22. |
When light wave
travels from one medium into another its
(a) Velocity, frequency and wave length does not change
(b) Velocity does not
change
(c) Wavelength does not change
(d) Frequency does
not change
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| : D |
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23. |
The gas law PVγ
constant is true for:
(a) Adiabatic changes only
(b) Isothermal changes
only
(c) Both isothermal and adiabatic changes
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| : A |
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24. |
Which of the
following particles is unstable
(a) Proton
(b) Alpha particle
(c) Neutron
(d)
Electron
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| : C |
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25. |
The power of
combination of a convex lens of focal length 50 cm and concave lens of focal
length 40 cm is
(a) +1 diopter
(b) -1 diopter
(c) 0
(d) +0.5 diopter
(e)
-0.5 diopter
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| : E |
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26. |
In a n-p-n
transistor amplifier, the collector current is 9mA. If 90% of the electrons from
the emitter reach the collector, then
(a)
α = 0.9; β = 9.0
(b) the base current is10mA
(c) the emitter current is 1mA
(d)
α
= 9.0; β = 0.9
(e) α
= 0.99; β = 99.0
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| : A |
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27. |
A ball hangs from a
string inside a train moving along a horizontal straight track. The string is
observed to incline towards the rear of the train making a constant small angle
with the vertical. It shows that the train is
(a) moving with a uniform acceleration
(b) moving
with a uniform velocity
(c) moving with a uniform retardation
(d) moving with an
acceleration which is increasing uniformly
(e) at rest
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| : E |
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28. |
The thermocouple cannot act as
(a) Thermometer
(b) Voltmeter
(c) Refrigerator
(d) a.c
generator
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| : D |
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29. |
The mean orbital radius of planet Pluto is 6 tera-meters.
Then the orbital radius in terms of mega meters is
(a) 6×106
(b) 6×105
(c) 6×109
(d) 6×108
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| : A |
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30. |
A liquid boils when its vapour pressure is
(a) greater than total external pressure on its surface
(b) equal to total external pressure on its surface
(c)
equal to atmospheric pressure
(d) less than total external pressure on its
surface
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| : B |
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31. |
When a vibrating turning fork is placed on a sonometer, a
large sound is heard. This is due to
(a) Forced vibration
(b) Reflection of sound
(c)
Beats
(d) Resonance
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| : A |
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32. |
The graph between
acceleration and time for the particle in SHM is
(a) Sinusoidal
(b) Parabola
(c) Straight line
(d)
Ellipse
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| : A |
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33. |
In a property biased
transistor
(a) both depletion layers are equally large
(b) both depletion layers are
equally small
(c) emitter-base depletion layer is large but base-collector layer
is small
(d) emitter-base depletion layer is small but
base-collector depletion layer is large
(e) both depletion layers vanish
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| : D |
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34. |
Maxwell in his
famous equation of electromagnetism introduced the concept
(a) AC current
(b) DC current
(c) displacement current
(d) impedance
(e) reactance
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| : C |
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35. |
Water is used in hot
water bottles because:
(a) water is not harmful to human body
(b) water has high
specific heat
(c) water is easily available
(d) it is not easy to heat
water
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| : B |
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36. |
Heavy water is one
of the substances used as moderator in reactors. Which of the following is also
used as moderator?
(a) Sea water
(b) Cobalt
(c) Graphite
(d) Titanium
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| : C |
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37. |
Out of the following
electromagnetic radiations, which has the shortest wavelength?
(a) radio waves
(b) infrared
(c) ultraviolet
(d) visible light
(e) X-rays
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| : E |
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38. |
92U238 decays
successively to form 90Th234, 91Pa234,
92U234, 90Th230 and 88Ra226
then during the reaction the number of particles emitted is
(a) 4
(b) 3
(c) 5
(d) 2
(e) 1
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| : B |
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39. |
If the velocity of
light c, gravitational constant G the Plank's constant h are chosen as
fundamental units, the dimension of length L in the new system is
(a) [h1 c1 G-1]
(b) [h1/2 c1/2
G-1/2]
(c) [h1 c-3 G-1]
(d) [h1/2 c-3/2 G1/2]
(e) [h1 c0 G0]
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| : D |
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40. |
A dim star magnitude
+14.5 explodes into a nova of magnitude +2. The factor by which the brightness
of the star has increased is
(a) 12.5
(b) 102
(c) 103
(d) 104
(e) 105
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| : E |
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41. |
A charged oil drop
of mass 9.75×10-15
kg and charge 30×10-16C is suspended in a uniform electric field
existing between two parallel plates. The field between the plates, taking
g=10ms-2, is
(a) 3.25 v/m
(b) 300 v/m
(c) 325 v/m
(d) 32.5 v/m
(e) 3000 v/m
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| : D |
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42. |
The transformer of an
audio amplifier has out put impedance 8000Ω and the speaker has input impedance
of 8Ω, the ratio of primary to secondary turns of this transformer connected
between the out put of amplifier and to loud speaker should have the ratio
(a) 1000:1
(b) 100:1
(c) 1:32
(d) 32:1
(e) 1:1000
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| : D |
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43. |
A possible fuel for
nuclear reactors is
(a) Lead
(b) Plutonium
(c) Berrylium
(d) Zirconium
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| : B |
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44. |
A monoatomic ideal gas initially at 170C
is suddenly compressed to one eighth of its original volume. The temperature
after compression is
(a) 170C
(b) 1360 C
(c) 8870C
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| : C |
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45. |
For an adiabatic
charge
(a) ∆u = 0
(b) ∆Q = ∆w
(c) ∆w = 0
(d) ∆u = −∆w
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| : D |
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46. |
In a closed tube, the frequencies of the overtones are
..... multiplies of the fundamental
(a) Even
(b) Odd
(c) Sub
(d) Integral
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| : B |
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47. |
The temperature above which a gas cannot be liquefied by
the application of mere pressure is called
(a) Critical temperature
(b) Boiling point
(c)
Boyle temperature
(d) Freezing point
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| : A |
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48. |
The dimensions of angular momentum are
(a) MLT―1
(b) ML―1T
(c) ML2T―1
(d) MLT―2
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| : C |
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49. |
The acceleration of an object moving in a straight line is
equal to the
(a) Slope of the displacement - time graph
(b) Area under velocity - time graph
(c) Area under displacement - time graph
(d) Slope of the
velocity - time graph
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| : D |
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50. |
In the photocells
(a) light is converted to heat
(b) electrical energy is converted to light
energy
(c) light energy is converted to electrical energy
(d) heat is converted to light
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| : C |
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