141 Q) "Why laser is used in the pipe alignment?
"
(a)They are directional in nature
(b)They are coherent
(c)They are monochromatic
(d)None of the above
142 Q) "You placed a car in an open a parking area in a summer day. After a few hours, you noticed that the heat is trapped inside the car. This phenomenon is known as
"
(a)Ozone depletion
(b)Greenhouse effect
(c)Solar effect
(d)Cosmic ray impingement
143 Q) Gravitational force shares a common feature with electromagnetic force. In both cases, the force is
(a)Between massive and neutral objects
(b)Between charged objects
(c)A short range
(d)A long range
144 Q) "A mirror produces magnified erect image of an object. The nature of the mirror is
"
(a)Convex
(b)Concave
(c)Plane
(d)Neither convex nor concave
145 Q) "A team of scientists at Brookhaven National Laboratory including those from India created the heaviest anti-matter (anti-helium nucleus). What is/are the implication/ implications of the creation of anti-matter?.
1.It will make mineral prospecting and oil exploration easier and cheaper.
2.It will help probe the possibility of the existence of stars and galaxies made of anti-matter.
3.It will help to understand the evolution of the universe.
Select the correct answer using the codes given below"
(a) Only 1
(b) 2 and 3
(c) Only 3
(d) 1, 2 and 3
146 Q) "To shield an instrument from an external magnetic field it may be placed in a cabinet made of
"
(a) wood
(b) ebonite
(c)metal
(d)diamagnetic substance
147 Q) "Which one of the following reactions is the main cause of the energy radiation from the Sun?.
"
(a)Fusion reaction
(b)Fission reaction
(c)Chemical reaction
(d)Diffusion reaction
148 Q) "The image form by an object of a compound microscope is
"
(a) virtual and enlarged
(b) virtual and diminish
(c) real and diminish
(d) real and enlarged
149 Q) "Which of the following has the most penetrating power?
"
(a) a- particles
(b) i- particles
(c) y- particles
(d) X-rays
150 Q) "Which one is not produce by sound waves in air?
"
(a) Refraction
(b)Polarisation
(c) diffraction
(d) reflection
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