171 Q) A current I flows through a potential difference V in an electrical circuit containing a resistance R. The product of V and I i.e., VI may be understood as
(a)Resistance R
(b)Heat generated by the circuit
(c)Thermal power radiated by the circuit
(d)Rate of change of resistance
172 Q) The cat survive fall from a height much more than human or any other animal. It is because the cat
(a)Has elastic bones
(b)Has thick and elastic skin
(c)Can immediately adjust itself to land on all four paws and absorbs the impact of fall by bending
(d)None of the above
173 Q) When we speak into a microphone, what type of vibrations the diaphragm executes?
(a) Free
(b) Forced
(c) Resonant
(d) None of these
174 Q) "Consider the following phenomena
1.Size of the sun at dusk
2.Colour of the sun at dawn
3.Moon being visible at dawn
4.Twinkle of stars in the sky
5.Polestar being visible in the sky
Which of the above are optical illusions?
"
(a)1,2 and 3
(b) 3, 4 and 5
(c) 1,2 and 4
(d) 2, 3 and 5
175 Q) "In the winter, we get warmer by using two blankets instead of one, why?
"
"(a)Two blankets are thicker, so generate more heat
"
(b)Two blanket enclose air which does not allow the cold to penetrate
(c)Two blanket compress the air between the body and the blankets
(d)None of the above
176 Q) "When a ball drops onto the floor it bounces. Why does it bounce?.
"
(a)The floor is perfectly fluid
(b)The floor heats up on impact
(c)Newton's third law implies that for every action (drop), there is a reaction (bounce)
(d)The floor exerts a force on the ball during the impact
177 Q) Two balloons are blown into spherical shape of unequal size and are connected through a narrow tube. Then what will observe?
(a)The smaller balloon becomes bigger
(b)The bigger balloon becomes smaller
(c)The smaller becomes smaller and the bigger becomes bigger
(d)There is no change in their size
178 Q) "Assertion (A) The SI units are logical and coherent.
Reason (R) SI system of units is the rationalised system,"
(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
179 Q) "To start your loaded trolley bag, you exert more force than when it is moving. This is an example of
"
(a)First law of thermodynamics
(b)Second law of thermodynamics
(c)Newton's second law of motion
(d)Newton's first law of motion
180 Q) "Which one of the following common devices works on the basis of the principle of mutual induction?.
"
(a)Tubelight
(b) Transformer
(c) LED
(d) Photodiode
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