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 221: The physical quantity that has the same dimensions as impulse is
Options:
A) energy
B) momentum
C) surface tension
D) pressure
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The correct answer is B .
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Question 222: In an ideal wheel an axle system, R stand for the radius of the wheel and r is the radius of the axle. the mechanical advantage is
Options:
A) (R/r)2
B) r/R
C) (r/R)2
D) R/r
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The correct answer is D .
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Question 223:
When blue and green colours of light are mixed, the resultant colour is
Options:
A) cyan
B) magenta
C) black
D) yellow
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The correct answer is A .
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Question 224: Which of the following arrangements of the components of electromagnetic spectrum is in ascending order of wavelengths?
Options:
A) Gamma rays, ultraviolet rays, X- rays, infra - red rays
B) Gamma rays, X-rays, ultraviolet rays, infra-red rays
C) infra-red rays, ultraviolet rays, X-rays, gamma rays
D) Gamma rays, ultraviolet rays, infra-red rays, X-rays
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The correct answer is B .
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Question 225: A short response to time is obtained in liquid-in-glass thermometer when the
Options:
A) bulb is large and thick-walled
B) stem is long and thin
C) bulb is small and thicked-walled
D) liquid is of high density and the bore is large
E) bulb is thin-walled and the liquid is a good conductor of heat
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The correct answer is E .
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Question 226: A 120V, 60W lamp is to be operated on 220V ac supply mains. calculate the value of non inductive resistance that would be required to ensure that the lamp is run on correct value
Options:
A) 100Ω
B) 200Ω
C) 300Ω
D) 500Ω
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The correct answer is B .
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Question 227:
The statements below were made by some students describing what happened during the determination of the melting point of solids.
I. the temperature of the solid was solid until melting started
Ii. the temperature of the solid rose until melting started
Iii. during melting, the temperature was rising
Iv. during melting, the temperature was constant
V. the temperature continued to rise after all the solid had melted
Vi. the temperature stopped rising after all the solid had melted. Which of the following gives correct statements in the right order?
Options:
A) ii, iv, and v
B) ii, iii and vi
C) i, iii and vi
D) i, iii and v
E) i, iv and v
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The correct answer is A .
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Question 228: A few grains of table salt were put in a cup of water, kept at constant temperature and left undisturbed. Eventually all the water tasted salty. The action is due to
Options:
A) convection
B) osmosis
C) capillarity
D) diffusion
E) conductivity
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The correct answer is D .
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Question 229: The physical properties of sound waves can best be described by
Options:
A) reflection and diffraction
B) polarization and reflection
C) polarization and diffraction
D) polarization and refraction
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The correct answer is A .
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Question 230: Which of the following is NOT an effect that can be produced by an electric current?
Options:
A) heat
B) light
C) sound
D) motion
E) none of the above
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The correct answer is E .