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 151: In an electrolysis experiment, a cathode of mass 5g is found o weigh 5.01g after a current of 5A flows for 50 seconds. What is the electrochemical equivalent of the deposited substance?
Options:
A) 0.00004g/C
B) 0.00002g/C
C) 0.02500g/C
D) 0.05000g/C
E) 0.00001g/C
Show Answer
The correct answer is A .
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Question 152: The unit of quantity of electricity is called
Options:
A) the ampere
B) the volts
C) the coulomb
D) the ammeter
E) electromotive force
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The correct answer is C .
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Question 153: A train with an initial velocity of 20ms-1 is subjected to a uniform deceleration of 2m-2. The time required to bring the train to a complete halt is?
Options:
A) 5s
B) 10s
C) 20s
D) 40s
Show Answer
The correct answer is B .
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Question 154: When equal weights of iron and water are subjected to equal supply of heat, it is found that the piece of iron become more hotter than water after a short time because
Options:
A) the specific heat of iron is higher than that of water
B) iron is in solid form
C) water is in liquid form
D) the specific heat of water is higher than that of iron
E) the specific heat of iron is infinite
Show Answer
The correct answer is D .
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Question 155: A band of 500 rectangular loops of wire of area 20 cm by 20 cm, encloses a region of magnetic field which charges from 1.0T to 0.4T within 5 seconds, calculate the induced e.m.f.
Options:
A) 5.60 v
B) 24.00 v
C) 0.24 v
D) 2.40 v
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The correct answer is D .
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Question 156: The melting point of naphthalene is 78oC. What is this temperature in kelvin
Options:
A) 100k
B) 351k
C) 378k
D) 444k
Show Answer
The correct answer is B .
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Question 157:
PQ is a thin rod on a horizontal table, RS is a plane mirror inclined at to the horizontal as shown above. The image of PQ as seen in the mirror by the eye T is
Options:
A) horizontal
B) parallel to the mirror
C) at infinity
D) vertical
E) highly magnified
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The correct answer is B .
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Question 158:
Which of the following instruments consumes the highest current?
I. Electric iron II. Television set III. Torch light IV. Immersion heater | 250v 220v 6v 110v | 1kW 110W 30W 500W |
Options:
A) I
B) II
C) III
D) IV
Show Answer
The correct answer is C .
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Question 159:
If ray travelling in air is incident on a transparent medium as shown in the diagram, the refractive index of the medium is given as
Options:
A) cosα / sinβ
B) sinα / sinβ
C) cosβ / sinα
D) sinβ / sinα
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The correct answer is A .
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Question 160: Which is the incorrect formula for a body accelerating uniformly?
Options:
A) a = v2 − u
B) v2 = u2 + 2as
C) s = ut + at2
D) v2 − u2= 2as
Show Answer
The correct answer is C .