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 411: At what depth below the sea-level would one experience a change of pressure equal to one atmosphere? Density of sea water = 1013kg-3, one atmosphere = 0.01 x 105Nm-2, g = 10ms-2
Options:
A) 0.1m
B) 1.0m
C) 10.0m
D) 100.0m
Show Answer
The correct answer is C .
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Question 412:
Which of the following bodies, each with centre of gravity G, lying on a horizontal table, is/are in unstable equilibrium?
Options:
A) II only
B) III only
C) I and IV only
D) II and III only
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The correct answer is B .
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Question 413:
The velocities of light in air and glass are 3.0 x 10ms and 2.0 x 10ms respectively. If the angle of refraction is 30º, the sine of the angle of incidence is?
Options:
A) 0.33
B) 0.50
C) 0.67
D) 0.75
Show Answer
The correct answer is D .
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Question 414:
A bar magnet is divided into two pieces, which of the following statement is correct?
Options:
A) two new magnets are created
B) the magnetic field of each separate piece becomes stronger
C) the electric field is created
D) the bar magnet is demagnetized
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The correct answer is A .
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Question 415: Which of the following is a set of vectors?
Options:
A) force, mass and moment
B) acceleration, velocity and moment
C) mass, weight and density
D) mass, volume and density
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The correct answer is B .
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Question 416: A particle of weight 120N is placed on a plane inclined at 300 to the horizontal. If the plane has an efficiency of 60% to the floor what is the force required to push the weight uniformly up the plane?
Options:
A) 50N
B) 100N
C) 175N
D) 210N
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The correct answer is B .
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Question 417: Two 50F parallel plate capacitors are connected in series. The combined capacitor is then connected across a 100-V battery. The charge on each plate of the capacitor is
Options:
A) 5.00 x 10-5C
B) 2.50 x 10-3C
C) 1.25 x 10-3C
D) 1.00 x 10-2C
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The correct answer is B .
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Question 418:
The figure above shows a conductor PQ carrying a current I in the direction shown. At a particular position near the conductor is a compass needle K. Neglecting the earth's magnetic field, the compass needle will
Options:
A) settle in any direction
B) settle in a fixed direction only if the conductor PQ is a magnetic material
C) settle in a fixed direction WHETHER the conductor PQ is a magnetic material OR NOT
D) be stationary
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The correct answer is C .
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Question 419: A radioactive isotope has a decay constant of 10-5s4. Calculate half life
Options:
A) 6.93 x 105s
B) 6.93 x 105s
C) 6.93 x104s
D) 6.93 x 104s
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The correct answer is C .
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Question 420: The rise or fall of a liquid in a narrow tube is because of the
Options:
A) viscosity of the liquid
B) surface tension of the liquid
C) friction between the walls of the tube and the liquid
D) osmotic pressure of the liquid
Show Answer
The correct answer is C .