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Old Thursday, March 22, 2007
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26. If u use a microscope to watch smoke particles in still air, u ll see them moving about all the time. This phenomenon is called ?

a. Brownian movement
b. Osmosis
c. Tyndall effect
d. Diffusion

27. The mass of a neutron is approximately

a. Equal to the mass of proton
b. Three times the mass of a proton
3. Twice the mass of a proton
4. Zero

28. The spherical shape of rain drops is due to

a. Atmospheric friction of air
b. Gravity of spherical earth
c. Surface tension of rain water
d. Viscosity of rain water

29. Galvanometer is an instrument

a. For measuring volume change in chemical reactions btw gases
b. For measuring currents of small magnitude
c. Which prints automatically messages sent from one place to another
d. For recording high temperature from a distance

30. Which of the following has highest frequency?

a. Gamma rays
b. Microwaves
c. Light waves
d. Radio waves

31. If an iron is marked 750 watts by 250 volts, then it was designated to take a current of

a. 3 Amperes
b. 9 Amperes
c. 6 Amperes
d. 15 Amperes

32. The blue colour of the sky is due to

a. Polarization of light
b. Scattering of light
c. Reflection of light
d. None of these

33. Geiger counter is an instrument

a. Determine the heart beat rate
b. To detect radioative radiation
c. To measure intensity of visible light
d. To count the baggage of an airport

34. When we are looking at a rainbow in front of us, The sun must be

a. high in the sky and is located either on our rigght or left
b. In front of us
c. Behind us

35. When as the satellite is in thhe geostationary orbit , its
a. Orbital distance is equal to the radius of the earth
b. Acceleration is zero
c. Orbital period is about 24 hours
d. Angular velocity is zero

36. The most intense man-made light souce is
a. Master
b Laser
c. Mercury Vapour Lamp
d. Light emitting diode (LED)

37. How many calories will b needed to raise the temperature of 10 grams of water from 200 to 3000?
a. 1
b. 10
c. 100
d. 200

38. The branch of biological science " Ecology " deals with the study of
a. Plants in relation to their environment
b. Animals in relation to plants
c. All living things in relation to their environment
d. Animals in relation to their environment

39. The film of oil and soapy water owe their brilliant colours to a combination of light reflection and
a. Refraction
b. Polarization
c. Diffraction
d. Interference

40. The solar ultraviolet rays fo not harm living organism because
a. The ozone layer of the atmosphere weakens them
b. They are weak rays
c. They have to pass through a thich column of the atmosphere
d. The atmospheric nitrogen dilutes them


41. Most important effect of moon on earth is that
a. Gives light
b. Causes earthquake
c. Causes solar & lunar eclipse
d. Effects tides of ocean

42. The term " Meteor" is applied to an interplanetary body,
a. Before it enter the earth`s atmosphere
b. After it enters the earth`s atmosphere
c. After it centers the earth`s atmosphere
d. After it centers the earth`s atmosphere and lands on the surface of the earth without exploding in mid air

43. Newton`s rings are
a. Celestial body named by newton
b. Rings presented to newton by a king
c. An optical phenomenon
d. Coloured rings observed around the point of contact of a convex lense

44. The heat recieved by earth from the sun is known as
a. Insulation
b. Solar heat
c. Solar radiation
d. Thermal radiation`s

45. Constellation is
a. Configuration of fixed stars resembling a figure
b. Group of satellites
c. Group of comets
d. None of above

46. Which of the following part of the atmosphere is nearest to the earth
a. Troposphere
b Stratosphere
c. Lonosphere
d. Mesosphere

47. To an astronaut in space sky looks
a. Deep blue
b. White
c. Black
d. Orange red

48. Why does the sun looks oval when it is at the horizon ?
a. When the sun is at the horizon rays from the longer edge are refracted more coz it passes through greater thickness of air so vertical diameter is shortened to give an oval shape
b. When at the horizon sun is pulled by other planets and becomes elongated
c. While setting or rising sun is elliptical
d. None of these

49. The moon has period of rotation which is equal to period of revolution . It is
a. 29 days, 7 hours , 43 min , 1147 sec
b. 20 days, 6 hours , 50 min , 20 sec
c. 31 days, 8 hours , 42 min , 10 sec
d. None of these

50. The composition of the sun is
a. hydrogen 90% , Helium 8% , Heavy elements 2%
b. hydrogen 95% , Helium 3% , Heavy elements 2%
c. hydrogen 80% , Helium 10% , Heavy elements 10%
d. None of above



Answers

26. a , 27. a , 28. a , 29. b , 30. a
31. a , 32. b , 33. b , 34. a , 35. a
36. a , 37. a , 38. b , 39. a , 40. a
41. d , 42. b , 43. d , 44. c , 45. a
46. a , 47. c , 48. a , 49. a , 50. a
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