Friday, January 08, 2016

MCQ on Common Observations


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

39.
Assertion
(A)
:
Telephone wires sag more in summer
 
Reason
(R)
:
Thus expand due to summer heat

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

40.
Assertion
(A)
:
Leakages in household gas cylinders can be detected
 
Reason
(R)
:
LPG contains ethyl merceptan which is smelling agent

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

41.
Assertion
(A)
:
Uranium undergoes nuclear fusion reaction
 
Reason
(R)
:
It has a big, unstable nucleus

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

42.
Assertion
(A)
:
Soap removes oil and dirt
 
Reason
(R)
:
Soap increases the surface tension of water

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

43.
Assertion
(A)
:
Air passengers sometimes feel pain in the ears when the plane rapidly loses height
 
Reason
(R)
:
Atmospheric pressure is larger at lower altitude

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

44.
Assertion
(A)
:
Red phosphorus is used in match stick
 
Reason
(R)
:
Red phosphorus is less dangerous compared to white

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

45.
Assertion
(A)
:
The escape velocity from the surface of the moon is less than that from the earth’s surface
 
Reason
(R)
:
The moon has no atmosphere

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

46.
Assertion
(A)
:
Hydrometer measures the concentration of salt in a solution
 
Reason
(R)
:
Hydrometer works on the principle of floating

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

47.
Assertion
(A)
:
The particle moving in a uniform circular motion has uniform velocity
 
Reason
(R)
:
The particle also has uniform speed

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

48.
Assertion
(A)
:
Red light is generally used as a caution symbol
 
Reason
(R)
:
It has a longer wave length

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

49.
Assertion
(A)
:
In high fedelity radio broadcasts frequency modulation (FM) is preferred over Amplitude Modulation (AM) for transmission purposes 
 
Reason
(R)
:
Atmospheric disturbances affect the amplitude of transmitted broadcast signals

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

50.
Assertion
(A)
:
Silver is not used to make electronic wires
 
Reason
(R)
:
Silver is a bad conductor

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

51.
Assertion
(A)
:
When a gun is fired it recoils, i.e. it pushes back, which much less velocity
 than the velocity of the bullet
 
 
Reason
(R)
:
Velocity of the recoiling gun is less because the gun is much heavier than the bullet

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

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