Physics is the science that studies the nature and properties of matter and energy. It covers topics like motion, heat, light, sound, electricity, magnetism, and the structure of atoms.
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Question 211: A load of 5N gives an extension of 0.56cm in a wire which obeys Hooke's law. What is the extension caused by a load of 20N?
Options:
A) 1.12cm
B) 2.14cm
C) 2.24cm
D) 2.52cm
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The correct answer is C .
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Question 212: The temperature at which the water vapour present in the air is just sufficient to saturate air is
Options:
A) Boiling point
B) Ice point
C) Saturation point
D) Dew point
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The correct answer is D .
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Question 213:
In a light experiment with a convex lens a student plotted a graph as shown above of the reciprocal of object distance (1)/u against the reciprocal of image distance (1)/v . the focal length of the lens is given as
Options:
A) slope of line PQ
B) Reciprocal of either OP or OQ
C) Length OP or OQ
D) area under the graph E ratio OP/OQ
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The correct answer is B .
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Question 214:
In the Figure above, QR is a vertical conductor and the current I flows from R to Q, P is a point on the horizontal plane and is to the south of the wire. The direction of the magnetic field at P due to the current is
Options:
A) Upward
B) North
C) South
D) West
E) East
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The correct answer is D .
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Question 215:
A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?
Options:
A) 1600
B) 1200
C) 200
D) 2400
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The correct answer is A .
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Question 216: Which of the following instruments can be used to measure current in an a.c circuit?
Options:
A) Hot wire ammeter
B) Moving coil ammeter
C) Tangent galvanometer
D) Moving coil galvanometer
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The correct answer is D .
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Question 217:
Heat is supplied uniformly at the rate of 100W to 1.0 x 10kg of a liquid for 20 seconds. If the temperature of the liquid rises by 5C, then the specific heat capacity of the liquid is
Options:
A) 2.0 x 10JkgK
B) 2.0 x 10Jkg
C) 4.0 x 10JkgK
D) 4.0 x 10Jkg
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The correct answer is C .
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Question 218:
In the diagram shown, If the south-poles of two magnets stroke a steel bar, the polarities at T and V will respectively be
Options:
A) north and south
B) south and south
C) north and north
D) south and north
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The correct answer is C .
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Question 219: A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river, what is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]
Options:
A) 8.0m
B) 5.5m
C) 5.0m
D) 4.5m
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The correct answer is D .
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Question 220: In a certain fusion reaction, a deuteron () interacts with a triton () and produces an a-particle () and a second product. The second product is
Options:
A) a proton
B) an electron
C) a neutron
D) a gamma ray
Show Answer
The correct answer is C .