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 631: If a tube of small radius opened at both ends is placed in a liquid, the liquid will
Options:
A) remain at the same level irrespective of whether the liquid wet the glass or not
B) fall below the liquid level if the liquid wets the glass
C) falls below the liquid level if the liquid does not wet the glass
D) rise above the liquid level if the liquid does not wet the glass
Show Answer
The correct answer is C .
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Question 632:
A force of 200N acts between two objects at a certain distance apart. The value of the force when the distance is halved is
Options:
A) 400N
B) 200N
C) 100N
D) 800N
Show Answer
The correct answer is D .
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Question 633:
A beam of light travelling in water is incident on a glass which is immersed in the water. The incident beam makes an angle of with the normal. Calculate the angle of refraction in the glass.
[Refractive index of water = 1.33, Refractive index of glass = 1.5]
Options:
A)
B)
C)
D)
Show Answer
The correct answer is D .
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Question 634: A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object?
Options:
A) 12cm
B) 24cm
C) 48cm
D) 108cm
Show Answer
The correct answer is B .
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Question 635:
The net capacitance of the circuit shown above is
Options:
A) 8.0µF
B) 6.0µF
C) 4.0µF
D) 2.0µF
Show Answer
The correct answer is D .
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Question 636: An object of mass 50kg is released from a height of 2m.Find the kinetic energy just before it strikes the ground
Options:
A) 250J
B) 1000J
C) 10 000J
D) 100 000J
Show Answer
The correct answer is B .
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Question 637: The atmospheric pressure due to water is 1.3 x 106Nm-2. What is the total pressure at the bottom of an ocean 10m deep? [Density of water = 1000kgm-3, g = 10ms-2]
Options:
A) 1.3 x 107Nm-2
B) 1.4 x 106Nm-2
C) 1.4 x 105Nm-2
D) 1.0 x 10 5Nm-2
Show Answer
The correct answer is B .
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Question 638: A wave disturbance travelling in air enters a medium in which its velocity is less than that in air. Which of the following statements is true about the wave medium?
Options:
A) both the frequency of the wave and the wavelength are decreased
B) the frequency of the wave is decreased while the wavelength is increased
C) the frequency of the wave is unaltered while the wavelength is decreased
D) the frequency of the wave is decreased while the wavelength is unaltered
Show Answer
The correct answer is C .
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Question 639: A cube of side 10cm and mass 0.5kg floats in a liquid with only of its height above the liquid surface. What is the relative density of the liquid?
Options:
A) 0.125cm-1
B) 0.250gcm-1
C) 0.625cm-1
D) 2.500cm-1
Show Answer
The correct answer is C .
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Question 640:
Which of the following is true of an electrical charge?
Options:
A) Positive charge means deficit electrons
B) Negative charge means excess of electrons
C) electric current means movement of electrons
D) All of the above
Show Answer
The correct answer is D .