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: The magnitude of the resultant of two mutually perpendicular forces, F1 and F2 is 13N, if the magnitude of F1 is 5N, what is the magnitude of F2?
Options:
A) 2.6N
B) 6.0N
C) 12.0N
D) 18.0N
Show Answer
The correct answer is C .
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Question 972:
The pin-hole camera produces a less sharply defined image when the
Options:
A) pin-hole is larger
B) illumination is less
C) screen is further from the pin-hole
D) object is further from the pin-hole
Show Answer
The correct answer is A .
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Question 973:

The diagram shown represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40, then the value of W is?
Options:
A) 28.0
B) 48.0N
C) 233.0N
D) 50.0N
Show Answer
The correct answer is D .
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Question 974:
If a body moves with a constant speed and at the same time undergoes an acceleration, its motion is said to be
Options:
A) circular
B) oscillatory
C) rectilinear
D) rotational
Show Answer
The correct answer is A .
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Question 975:
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 976: Flourescent tubes produces light by the
Options:
A) excitation of gas molecules
B) conduction of solar energy
C) refraction of light by gas molecules
D) thermal agitation of electron in the tubes
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The correct answer is A .
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Question 977: Heat is supplied uniformly at the rate of 100W to 1.0 x 10-2kg of a liquid for 20 seconds. If the temperature of the liquid rises by 5oC, then the specific heat capacity of the liquid is
Options:
A) 2.0 x 102Jkg-1k-1
B) 2.0 x 102Jkg-1
C) 4.0 x 104Jkg-1k-1
D) 4.0 x 104kg-1
E) 8.4 x 103Jkg-1k-1
Show Answer
The correct answer is C .
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Question 978: Dewpoint is the temperature at which, water vapour in the atmosphere
Options:
A) turns into steam
B) solidifies into ice pellets
C) first condenses into liquid form
D) is just sufficient to cause cooling
E) has a relative humidity of fifty percent
Show Answer
The correct answer is D .
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Question 979: 2 kg of water is heated with a heating coil which draws 3.5 A from a 200 V mains for 2 minutes. what is the increase in temperature of the water?
[specific heat capacity of water = 4200 jkg -1k-1]
Options:
A) 30°
B) 25°
C) 15°
D) 10°
Show Answer
The correct answer is D .
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Question 980: A pencil is placed vertically between a concave mirror and its focal point. The image of the pencil in the mirror will be
Options:
A) real, inverted and diminished
B) virtual, inverted and enlarged
C) real, erect and enlarged
D) virtual, erect and enlarged
Show Answer
The correct answer is D .