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 671: A hose of cross-sectional area 0.5m2 is used to discharge water from a water tanker at a velocity of 60ms-1 in 20s into a container. If the container is filled completely, the volume of the container is
Options:
A) 240m3
B) 600m 3
C) 2400m 3
D) 6000m3
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The correct answer is B .
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Question 672: If the refractive index of a medium in air is 2.0, what is the critical angle for this medium?
Options:
A) 30o
B) 42o
C) 45o
D) 50o
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The correct answer is A .
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Question 673:
A supply of 400V is connected across capacitors of 3μf and 6μf in series. Calculate the charge.
Options:
A) 8 x 10C
B) 4 x 10C
C) 8 x 10C
D) 4 x 10C
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The correct answer is A .
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Question 674: For correcting long sight defects in the human eye we require a
Options:
A) converging lens
B) diverging lens
C) microscope
D) periscope
E) plain glass sheet
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The correct answer is A .
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Question 675: Which of the following statements is applicable to a real image formed by a concave mirror? i. it can be observed on a screen ii. it is always inverted and in front of the mirror iii. it only seams to exist IV. it is formed by the actual converging of rays of light
Options:
A) i, ii and iii
B) i, ii and iv only
C) i and ii only
D) i and ii only
E) all four statements
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The correct answer is B .
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Question 676:
Calculate the velocity ratio of a screw jack of pitch 0.2cm if the length of the tommy bar is 23cm
Options:
A) 230
B) 23
C) 70
D) 140
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The correct answer is A .
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Question 677: A hydraulic press has a large circular piston of radius 0.8m and a circular plunger of radius 0.2m. A force of 500N is exerted by the plunger. Find the force exerted on the piston
Options:
A) 8000N
B) 4000N
C) 2000N
D) 31N
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The correct answer is D .
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Question 678: A charged particle is moving in a uniform magnetic field. if the direction of motion of the charged particle is parallel to the magnetic field, the path of the charge will
Options:
A) Be a straight line
B) Curve inwards
C) Be a parabola
D) Curve outwards
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The correct answer is A .
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Question 679: The resultant of two forces acting on an object is maximum if the angle between them is
Options:
A) 45°
B) 0°
C) 90°
D) 180°
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The correct answer is B .
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Question 680: The temperature gradient across a copper rod of thickness 0.02m, maintained at two temperature junctions of 20°C and 80°C respectively is
Options:
A) 3.0 x 102Km-1
B) 3.0 x 103Km-1
C) 5.0 x 103Km-1
D) 3.0 x 104Km-1
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The correct answer is B .