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 971:
"Sum of all forces acting on a body is zero." This condition represents equilibrium'
Options:
A) First condition
B) Second condition
C) Third condition
D) Fourth condition
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The correct answer is A .
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Question 972: Which of the following is TRUE of light and sound waves?
Options:
A) they both transmit energy
B) they both need a mediumfor propagation
C) they are both transverse waves
D) their velocities in air are equal
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The correct answer is A .
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Question 973:
I. Coherence
II. Same frequency
III. Same wavelength
IV. Same Intensity
Which of the conditions above are necessary to produce interference fringes?
Options:
A) I and III
B) I, II and IV
C) I, II and III
D) II and III
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The correct answer is C .
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Question 974: The kinetic theory of photoelectron liberated from a metallic surface depends on the
Options:
A) intensity of the incident radiation
B) time duration of the incident radiation
C) temperature of the incident radiation
D) frequency of the incident radiation
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The correct answer is D .
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Question 975: Two bodies have masses in the ratio 3:1. They experience forces which impart 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 976: Which of the following has no effect on radiation?
Options:
A) nature of surface
B) density
C) surface area
D) temperature
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The correct answer is B .
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Question 977: The instantaneous value of the induced e.m.f as a function of time is ε = εo sin ωt where εo is the peak value of the e.m.f. The instantaneous value of the e.m.f., one quarter of the period is
Options:
A) 0.00
B) εo/4
C) εo/2
D) εo
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The correct answer is D .
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Question 978: The combination of sound waves with different frequencies is known as
Options:
A) interference
B) diffraction
C) superposition
D) forced vibration
E) resonance
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The correct answer is C .
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Question 979: On which of the following is the operation of a moving coil galvanometer based?
Options:
A) Magnetic effect of electric current
B) Electromagnetic induction
C) Chemical reaction produced by electricity
D) Force on current carrying conductor in a magnetic field
E) Electrical energy and power
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The correct answer is D .
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Question 980: 22,000J of heat is required to raise the temperature of 1.5kg of paraffin from 20oC to 30oC. Calculate the specific heat capacity of paraffin.
Options:
A) 1466Jkg-1oC-1
B) 2933Jkg-1oC-1
C) 4400Jkg-1oC-1
D) 5866Jkg-1oC-1
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The correct answer is A .