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 141: A train has an initial velocity of 44ms-1 and an acceleration of -4ms-1. Its velocity after 10 seconds is
Options:
A) 2ms-1
B) 4ms-1
C) 8ms-1
D) 12ms-1
E) 16ms-1
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The correct answer is B .
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Question 142: The velocities of light in air and glass are 3.0 x 108ms-1 and 2.0 x 108ms-1 respectively. If the angle of refraction is 30°, the sine of the angle of incidence is
Options:
A) 0.33
B) 0.50
C) 0.67
D) 0.75
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The correct answer is D .
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Question 143:
A man stands 4m in front of a plane mirror. If the mirror is moved 1m towards the man, the distance between him and his new image is?
Options:
A) 3m
B) 5m
C) 6m
D) 10m
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The correct answer is C .
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Question 144: Which of the following i. -particles ii. protons iii. neutrons iv. -particles. may be found in light nuclei?
Options:
A) i and ii
B) i and iii
C) ii and iv
D) ii and iii
E) i, ii and iii
Show Answer
The correct answer is D .
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Question 145:
If a sound wave goes from a cold air region to a hot air region, its wavelength will?
Options:
A) increase
B) decrease
C) decrease then increase
D) remain constant
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The correct answer is A .
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Question 146: The distance between the fixed points of a centigrade thermometer is 20cm. What is the temperature when the mercury level is 4.5cm above the lower mark?
Options:
A) 22.5oC
B) 29.0oC
C) 90.0oC
D) 100.0oC
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The correct answer is A .
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Question 147: A capacitor 8F is charged to a potential difference of 100V. The energy stored by the capacitor is
Options:
A) 1.0 x 104J
B) 8.0 x 10J
C) 1.25 x 10J
D) 4.0 x 10-2J
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The correct answer is D .
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Question 148: Which of the following with respect to a body performing simple harmonic motion are in phase?
Options:
A) displacement and velocity of the body
B) displacement and force on the body
C) velocity and acceleration of the body
D) force acting on the body and the acceleration
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The correct answer is C .
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Question 149:
A string is sustaining a stationary wave when
Options:
A) the frequency of the wave is not proportional to the wavelength of the wave
B) the amplitude of vibration is always zero
C) two equal waves are travelling in opposite directions
D) the waves are longitudinal
E) the frequency is directly proportional to the length of the string
Show Answer
The correct answer is C .
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Question 150:
A body is under action of a force F such that the force displacement graph of the body is semi circular as shown above. The work done on the body by the force in moving through 24 meters is
Options:
A) 36π J
B) 72π J
C) 144π J
D) 288π J
Show Answer
The correct answer is B .