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 721:
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 722: Two forces A and B act at a point. If their resultant is [given by] (B - A) in the direction of B, then
Options:
A) A and B are equal
B) A is greater than B
C) the angle between A and B is 0°
D) the angle between A and B is 90°
E) the angle between A and B is 180°
Show Answer
The correct answer is E .
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Question 723: Which of the following statements is correct about light and sound waves? Both
Options:
A) are longitudinal waves
B) are transverse waves
C) have the same velocity in air
D) need a medium for propagation
E) transmit energy
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The correct answer is E .
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Question 724: A hydrometer is an instrument used in measuring
Options:
A) vapour pressure of a fluid
B) density of liquid
C) relative humidity of a liquid
D) relative density of a liquid
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The correct answer is D .
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Question 725: A constant force of %n acts for a % seconds on a mass of 5kg initially at rest. Calculate the final momentum
Options:
A) 125kgms−1
B) 25kgms−1
C) 15kgms−1
D) 0kgms−1
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The correct answer is B .
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Question 726: A body moves along a circular path with uniform angular speed of 0.6 rad s-1 and at a constant speed of 3.0ms-1. Calculate the acceleration of the body towards the centre of the circle.
Options:
A) 25.0ms-2
B) 5.4 ms-2
C) 5.0ms-2
D) 1.8 ms-2
E) 0.2ms-2
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The correct answer is D .
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Question 727: Heat transfer by convection will take place is one the following substance.
Options:
A) Stone
B) Wood
C) Mercury
D) Water
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The correct answer is D .
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Question 728: Which of the following pairs of musical instruments produce sound due to the vibration of air column?
Options:
A) Bell and piano
B) Guitar and flute
C) Trumpet and drum
D) Trumpet and flute
E) Violin and organ
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The correct answer is D .
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Question 729: In a D.C. circuit, a 10 microfarad (mf) capacitor is placed in series with a 10 0hm resistor. The total resistance of the combination is
Options:
A) 10 ohms
B) 1 ohms
C) zero
D) 20 ohms
E) infinite
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The correct answer is E .
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Question 730:
A few grains of table salt were put in a cup of cold water, kept at constant temperature and left undistributed. Eventually all the water tested salty. This action isdue to?
Options:
A) convection
B) osmosis
C) capillarity
D) diffusion
Show Answer
The correct answer is D .