MCQ ON COMMON OBSERVATIONS
1.Most soluble in water is
a) Camphor b) Sugar c)
Sulphur d)
Common Salt
2.Photosynthesis is
a) an exothermic process b)
an endothermic process
c) a neutral process d)
a thermostatic process
3.Which one of the following
substance exhibit the property of sublimation ?
a) Ice b) Wax c) Camphor d) Ethyl alcohol
4.Water is neither acidic nor
alkaline because
a) It cannot accept or donate
protons
b) It boils at a high temperature
c) It can dissociate into equal
number of hydrogen ions
d) It cannot donate or accept
electrons
5.Very small time intervals are
accurately measured by the
a) Pulsars b) Quartz clocks c) Atomic clocks d) White dwarfs
6.An ordinary tube light used for
lighting purposes contains
a) Fluorescent material and an
inert gas
b) One filament , reflective
material and mercury vapour
c) Fluorescent material and
mercury vapour
d) Two filaments, fluorescent
material and mercury vapour
7.The jet plane engine works on
the principle of
a) Mass b) Linear momentum c) Energy d)
Angular momentum
8.The working of the quartz
crystal in the watch is based on
a) Johnson effect b)
Photoelectric effect
c) Edison effect d)
Piezo electric effect
9.A handwritten message can be
instantly transmitted as such to any part of the world through
a) Speed post b) Telex c)
Electronic Mail d) FAX
10.The number of points in a
mariner’s compass is
a) 64 b) 32 c) 24 d) 8
11.Rocket works on the principle
of
a) Conservation of mass b)
Conservation of energy
c) Conservation of momentum d) None of
these
12.In an electronic watch, the
component corresponding to a pendulum of a pendulum clock is
a) Transistor b) Balance wheel c) Crystal oscillator d) Diode
13.The silvered surface of thermo
flask prevents transfer of heat by
a) Conduction b) Convection c) Radiation d) All of these
14.A pendulum clock will run
faster at one of the following places than others
a) Mine b) Sea shore c) On a mountain d) 20th Floor of a building
15.When ice melts into water, its
a) Volume increases b)
Mass increases
c) Volume decreases d)
Mass decreases
16.The weight of an object would
be minimum when it is placed,
a) At the equator b)
At the north pole
c) At the south pole d)
At the centre of the earth
17.When an open bottle of scent
is kept in a corner of the room, its odour is felt in all the corners. This is
due to the phenomenon of
a) Vaporisation b) Evaporation c) Diffusion d) Sublimation
18.With rise in temperature, the
speed of sound
a) Increases b) Drops c) Remains the
same d) Changes
19.When a constant force is
applied to a body, it moves with uniform
a) Speed b) Velocity c) Acceleration d) Momentum
20.A piece of paper and a cricket
ball are dropped simultaneously from the same height. They will strike the
ground simultaneously, if they
a) have the same volume b)
have the same mass
c) have the same density d)
are in vacuum
21.The time period of a pendulum
on moon
a) Becomes zero b) Increases c) Remains same d) Decreases
22.A piece of wood is floating in
water. If we heat the water, the piece of wood will
a) Increases in size b)
Rise a little
c) Float at the same level d)
Sink a little
23.A pond is covered with a layer
of ice and the external temperature is
- 300 C. The temperature of water in contact with the lower surface of
ice is
a) 40 C b) 0o C c) -15o C d) -300 C
24.Two objects losing the same
weight when immersed in water must have the same
a) Weight in water b) Volume c) Weight in air d) Density
25.If the density of water at 0o
C, 40 C and 1000 C are denoted by X,Y and Z respectively. Then the correct
sequence of their decreasing order is
a) X,Y,Z b) Y,Z,X c) Y,X,Z d) Z,Y,X
26.Friction can be reduced by
a) Dynamic to static b)
Rolling to sliding
c) Sliding to rolling d)
None of theses
27.An air bubble in water will
act like a
a) Convex mirror b) concave mirror c) Convex lens d) Concave lens
28.When a person is standing on a
weighing scale in a lift and the lift is moving upwards, then the weighing
scale will show
a) Actual weight of the person b) Less
weight
c) Higher weight d)
Zero reading
29.Clear nights are colder than
cloudy nights because of
a) Conduction b) Condensation c) Radiation d) Insolation
30.On which of the following
factors does the temperature of steam in a pressure cooker depend ?
a) Material of which cooker is
made b) Temperature
of the flame
c) Quantity of cooking material d) Size of the
pressure cooker
31.Nights are cooler in the
desert because
a) Sand radiates heat less
quickly as compared to earth
b) The sky is generally clear
c) Sand radiates heat more
quickly as compared to earth
d) The sky is generally cloudy
32.Pouring of kerosene oil on
stagnant water reduces mosquito problem because
a) It is highly toxic to the
mosquitoes b) It
interrupts the mating of adults
c) It repels the mosquitoes d) It
interrupts the breathing of larvae
33.When water is heated from 00 C
to 100 C, the volume of water
a) Increases steadily b)
Decreases steadily
c) First increases then decreases d) First decreases
then increases
34.When a person enters a dark
room from bright light, he cannot see anything clearly for some times. Slowly,
he starts seeing things. This is because
a) The length of lens increases b) The iris
expands
c) The iris contracts d)
The distance between lens and retina increases
35.Burns caused by the steam are
much more severe than those caused by boiling water as
a) Steam is a gas and engulfs the
body quickly b) Temperature of steam is
higher
c) Steam pierces through the
pores of body quickly
d) Steam has latent heat
36.If you float on your back, on
water, your weight will be
a) Less than the weight of water
displaced by you
b) Zero b) Half of your normal weight d) equal to your normal
weight
37.Due to which of the following
a shaving blade when placed gently on water floats ?
a) Surface tension b) Viscosity c) Law of Floatation d) Archimedes principle
38.Which of the following type of
wood(s) is/are specially used as railway sleepers ?
a) Mahogany b) Ivory wood c) Green heart wood d) Jarrah and Barri
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39.
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Assertion
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(A)
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:
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Telephone wires sag more in summer
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Reason
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(R)
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:
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Thus expand due to summer heat
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a) Both
A and R are true and R is the correct explanation of A
b) Both
A and R are true But R is not the correct explanation of A
c) A
is true but R is false
d) A
is false but R is true
e) Both
A and R are false
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40.
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Assertion
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(A)
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:
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Leakages in household gas cylinders can be detected
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Reason
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(R)
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:
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LPG contains ethyl merceptan which is smelling agent
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a) Both
A and R are true and R is the correct explanation of A
b) Both
A and R are true But R is not the correct explanation of A
c) A
is true but R is false
d) A
is false but R is true
e) Both
A and R are false
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41.
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Assertion
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(A)
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:
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Uranium undergoes nuclear fusion reaction
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Reason
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(R)
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:
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It has a big, unstable nucleus
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a) Both
A and R are true and R is the correct explanation of A
b) Both
A and R are true But R is not the correct explanation of A
c) A
is true but R is false
d) A
is false but R is true
e) Both
A and R are false
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42.
|
Assertion
|
(A)
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:
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Soap removes oil and dirt
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Reason
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(R)
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:
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Soap increases the surface tension of water
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a) Both
A and R are true and R is the correct explanation of A
b) Both
A and R are true But R is not the correct explanation of A
c) A
is true but R is false
d) A
is false but R is true
e) Both
A and R are false
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43.
|
Assertion
|
(A)
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:
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Air passengers sometimes feel pain in the ears when the plane rapidly
loses height
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Reason
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(R)
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:
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Atmospheric pressure is larger at lower altitude
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a) Both
A and R are true and R is the correct explanation of A
b) Both
A and R are true But R is not the correct explanation of A
c) A
is true but R is false
d) A
is false but R is true
e) Both
A and R are false
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44.
|
Assertion
|
(A)
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:
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Red phosphorus is used in match stick
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Reason
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(R)
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:
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Red phosphorus is less dangerous compared to white
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a) Both
A and R are true and R is the correct explanation of A
b) Both
A and R are true But R is not the correct explanation of A
c) A
is true but R is false
d) A
is false but R is true
e) Both
A and R are false
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45.
|
Assertion
|
(A)
|
:
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The escape velocity from the surface of the moon is less than that
from the earth’s surface
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Reason
|
(R)
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:
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The moon has no atmosphere
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a) Both
A and R are true and R is the correct explanation of A
b) Both
A and R are true But R is not the correct explanation of A
c) A
is true but R is false
d) A
is false but R is true
e) Both
A and R are false
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46.
|
Assertion
|
(A)
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:
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Hydrometer measures the concentration of salt in a solution
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Reason
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(R)
|
:
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Hydrometer works on the principle of floating
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a) Both
A and R are true and R is the correct explanation of A
b) Both
A and R are true But R is not the correct explanation of A
c) A
is true but R is false
d) A
is false but R is true
e) Both
A and R are false
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47.
|
Assertion
|
(A)
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:
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The particle moving in a uniform circular motion has uniform velocity
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|
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Reason
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(R)
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:
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The particle also has uniform speed
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a) Both
A and R are true and R is the correct explanation of A
b) Both
A and R are true But R is not the correct explanation of A
c) A
is true but R is false
d) A
is false but R is true
e) Both
A and R are false
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48.
|
Assertion
|
(A)
|
:
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Red light is generally used as a caution symbol
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|
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Reason
|
(R)
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:
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It has a longer wave length
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a) Both
A and R are true and R is the correct explanation of A
b) Both
A and R are true But R is not the correct explanation of A
c) A
is true but R is false
d) A
is false but R is true
e) Both
A and R are false
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49.
|
Assertion
|
(A)
|
:
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In high fedelity radio broadcasts frequency modulation (FM) is
preferred over Amplitude Modulation (AM) for transmission purposes
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|
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Reason
|
(R)
|
:
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Atmospheric disturbances affect the amplitude of transmitted
broadcast signals
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a) Both
A and R are true and R is the correct explanation of A
b) Both
A and R are true But R is not the correct explanation of A
c) A
is true but R is false
d) A
is false but R is true
e) Both
A and R are false
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50.
|
Assertion
|
(A)
|
:
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Silver is not used to make electronic wires
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Reason
|
(R)
|
:
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Silver is a bad conductor
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a) Both
A and R are true and R is the correct explanation of A
b) Both
A and R are true But R is not the correct explanation of A
c) A
is true but R is false
d) A
is false but R is true
e) Both
A and R are false
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51.
|
Assertion
|
(A)
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:
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When a gun is fired it recoils, i.e. it
pushes back, which much less velocity
than the velocity of the
bullet
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|
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Reason
|
(R)
|
:
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Velocity of the recoiling gun is less because the gun is much heavier
than the bullet
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a) Both
A and R are true and R is the correct explanation of A
b) Both
A and R are true But R is not the correct explanation of A
c) A
is true but R is false
d) A
is false but R is true
e) Both
A and R are false
52.Which one of the following has
the highest Calorific Value ?
a) Butane b) Biogas c)
Hydrogen d) Methane
53.The colour of light is
determined by its
a) Velocity b) Amplitude c) Wavelength c) Frequency
54.Which of the following is not
an Operating system in any Compute ?
a) Window b) Unix c)
MS-Dos d)
Pentium
55.Which among the following is
least prone to fire ?
a) Terrycot b) Nylon c) Rayon d) Cotton
56.If a wire of resistance R is
melted and recast to half of it’s length then the new resistance of the wire
will be
a) R/4 b) R/2 c) R d) 2R
57.An electron microscope gives
higher magnification than an optical microscope because
a) The wavelength of electrons is
smaller as compared to the wavelength of visible light
b) The electrons have more energy
than the light particulars
c) The electron microscope uses
more powerful lenses
d) The velocity of electron is
smaller than that of light
58.In an observation, αparticles, β
particles and γ
rays have same energies. This penetrating power in a given medium in increasing
order will be
a) α,β,γ b) β,γ,α c)
α,γ,β d)
β,α,γ
