31 .A soap buble is given negative charge then its radius
A.  decreases
B.  increases
C.  remains unchanged
D.  none of these
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32 .The pressure exerted on the walls of the container by a gas is due to the fact that the gas molecules
A.  Lose their kinetic enrgy
B.  Stick to the walls
C.  Are accelerated towards the walls
D.  Change their momenta due to collision with the walls
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33 .Which of the following is used by dentis to see the image of teech of a patient?
A.  Cancave lense
B.  Convex lense
C.  Convex mirror
D.  None of these
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34 .The unit of electrical power is
A.  Volt
B.  Watt
C.  Kilowatt hour
D.  Ampere
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35 .Velocity of light is maximum is
A.  Diamond
B.  water
C.  glass
D.  vaccum
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36 .What is the primary source of food for marine life?
A.  Phytoplankton
B.  Zooplankton
C.  Sea weed
D.  Grass
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37 .Air pollution by 'Fly ash' is caused by:
A.  Hydro-electric Power Stations
B.  Power generation through wind – farms
C.  Coal combustion in Thermal Power Plants
D.  Nuclear Power Plants
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38 .Which one of the following is not a site for in - situ method of conservation of flora?
A.  Biosphere Reserve
B.  Botanical Garden
C.  National park
D.  Wildlife Sanctuary
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39 .Which one among the following is not responsible for 'green house effect'?
A.  Water
B.  Carbon dioxide
C.  Nitrogen
D.  Chlorofluorocarbons
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40 .Which are the relevant waves in telecommunication?
A.  X – rays
B.  Violet – rays
C.  microwaves
D.  all of them
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41 .For television broadcasting the frequency employed is normally
A.  30 – 300 MHz
B.  30 – 300 GHz
C.  30 – 300 kHz
D.  30 – 300 Hz
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42 .The image formed on the retine of a human eye is
A.  virtual and inverted
B.  virtual and erect
C.  real and erect
D.  real and inverted
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43 .Woollen clothes keep the body warm because
A.  Wool incrases the temperature of the body
B.  Wool is the bad conductor of the heat so it does not allow heat to flow out of the body
C.  Wool absorbs radiant heat from outer objects
D.  Wool rejects heat from outer objects
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44 .The main pollutant responsible for Bhopal Gas Tragedy is:
A.  Methyl isocyanate
B.  Bromine
C.  Chlorofluro carbon
D.  Chlorine
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45 .The nature of sun's spectrum is
A.  Continuous spectrum with absorption lines
B.  Line emission
C.  The spectrum of the Helium atom
D.  Continuous spectrum
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