1.
Parsec is a measure of - Astronomical distance
2.
The blue colour of the water in the sea is due to – Scattering
of blue light by water molecules
3.
Galvanized iron is coated with a thin coating of - Zinc
4.
In the visible spectrum the colour
having the shortest wavelength is – Violet
5.
The unit of power is - Joule
per second and watt both
6.
The heater element in an electric iron is made of – Nichrome
7.
If woolen cloth of red colour is seen in the light of a mercury vapour lamp,
then the cloth will appear – Black
8.
At sun rise or at sun set, the sun appears to be reddish while
at midday it looks white. This is because of – Scattering
due to dust particles an air molecules causes this phenomenon
9.
The radiant energy of the sun results from – Nuclear
fusion
10.
A microscope, in which maximum magnification is achieved, but the object cannot
be seen by eye, is called
– Electron
microscope
11.
The image formed on the retina of the eye is – real
and inverted
12.
The transverse nature of light is shown by – Polarization of light
13.
The surface of water in a lake is just going to freeze. What is the temperature
of water at the bottom - 40 C
14.
Out of water, glycerin, alcohol, air and
coal tar - which one is the most
viscous medium – coal tar
80.
A double convex air bubble in water would behave as a - Divergent lens
16.
Railway tracks are banked on curves so that - Necessary
centripetal force may be obtained from the horizontal component of the weight
of the train
17.
The density of water is maximum at - 40C
18.
Oil rises up the wick in a lamp because - Of the surface tension phenomenon
19.
An ice cube contains an iron ball in it and floats in water contained in a
vessel. What will happen if the ice melts away - The water level will go down
20.
Which of the following utilizes Newton’s third law of motion? - Space
–rocket
21.
The function of cement in masonry (stonework) is based on the phenomenon of - Adhesion
22.
The main sources of heat is - The
sun
23.
Transmission of heat by the movement of heated particles is called - Convection
24.
The air becomes heated by - Convection
25.
In a thermos flask, a warm substance remains warm because - No
heat neither enters into nor leaves the inside of the thermos flasks by any of
the three methods of transmission conduction, convection and radiation
26.
To a space traveler on the moon during day time the lunar sky appears - Black
27.
At which temperature do the reading of the Centigrade and the Fahrenheit scale
coincide - -400
C
28.
Sound is a form of - Energy
29.
Lightning is observed earlier than the sound is heard, because - Light travels faster than sound
30.
The instrument connected with the recording and reproduction of sound is called
- Gramophone
31.
A mirage is the result of - Increase in the refractive index of the atmosphere with height
32.
The dense mass of small water drops on smoke or dust particles in the lower
layers of the atmospheres -
Fog
33.
A person can not see objects clearly which are nearer than 75 cm from his eyes.
What disease is he suffering from
- Hypermetropia (long-sightedness)
34.
a man can not see clearly beyond 10 meters. What disease is he
suffering from - Myopia
(shortsightedness)
35.
A pond of clear water appears less deep than it really is. This is due to - Refraction
36.
An earth satellite is kept moving in its orbit. It is due to the phenomenon of centripetal force provided by
- The
gravitational attraction of the earth on the satellite
37.
The speed of light was first measured by - Romer
38.
The phenomenon of radio activity is associated with - Decay of the nucleus
39.
When water freezes its density - Decreases
40.
A ‘Celsius’ is a unit - Equivalent
to degree centigrade
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