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 241:
An object is acted upon by a system of parallel three causing the object to be in state equilibrium. Which of the following statement is not correct
Options:
A) the resultant of the parallel forces is zero
B) the algebraic sum of all the moments of the forces is zero
C) all the parallel forces must be equal in magnitude and direction
D) the sum of forces in one direction must be equal to the sum of forces in the opposite direction
Show Answer
The correct answer is C .
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Question 242: The colours seen in the thin films of oil on the road and in soap bubbles are due to
Options:
A) reflection
B) interference
C) diffraction
D) polarization
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The correct answer is A .
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Question 243: Two spheres of masses 5.0 kg and 10.0 kg are 0.3 m apart. Calculate the force of attraction between them?
[G = 6.67 X 10-11 Nm2 Kg2]
Options:
A) 3.50 x 10-10N
B) 3.71 x 10-8 N
C) 3.57 x 10-2N
D) 4.00 x 102N
Show Answer
The correct answer is B .
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Question 244: 250g of lead at 170oC is dropped into 100g of water at 0oC. If the final temperature is 12oC, the specific heat of lead is (specific heat of water is 4,200J/kgoC)
Options:
A) 39.5J/kgoC
B) 50.4J/kgoC
C) 127.6J/kgoC
D) 154.6J/kgoC
E) 173.4J/kgoC
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The correct answer is C .
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Question 245:
Two bodies have masses in the ratio3:1. They experience forces whichimpart to them,acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced
Options:
A) 1:4
B) 2:1
C) 2:3
D) 2:5
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The correct answer is C .
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Question 246: Shadows and eclipses result from the
Options:
A) refraction of light
B) rectilinear propagation of light
C) defraction of light
D) reflection of light
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The correct answer is B .
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Question 247: An object is placed in front of a converging lens of a focal length 20cm. The image is virtual and has a magnification of 2. What is the distance of the object from the lens?
Options:
A) 5cm
B) 10cm
C) 30cm
D) 40cm
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The correct answer is B .
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Question 248: Which of the following is correct about an electric cell?
Options:
A) Primary cell produces a large current for a long time
B) Secondary cell has a very high internal resistance
C) Primary cell has a very low internal resistance
D) Secondary cell has a very low internal resistance
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The correct answer is D .
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Question 249: Calculate the amount of heat required to convert 2kg of ice at 2oC to water at 0oC. [specific heat capacity of ice = 2090Jkg-1oC-1, specific latent heat of fusion of ice = 333kJkg-1]
Options:
A) 666J
B) 8360J
C) 666 000J
D) 674 360J
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The correct answer is D .
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Question 250: Which of the following types of waves cannot travel through a vacuum?
Options:
A) sound waves
B) light waves
C) infra-red waves
D) x-radiation
E) redio waves
Show Answer
The correct answer is A .