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Free download in PDF CBSE Class 10 Science Objective Type Questions with Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE Class 10 Students.
121
A positive charge is moving towards a person. The direction of magnetic field lines will be in
A
Anticlockwise direction
B
Vertically downward direction
C
Vertically upward direction
D
Clockwise direction
View Answer
Answer: Anticlockwise direction
122
An induced emf is produced when a magnet is moved into a coil. The magnitude of induced emf does not depend on:
A
The resistivity of the wire of the coil
B
The strength of the magnet
C
The number of turns of the coil
D
The speed with which the magnet is moved
View Answer
Answer: The resistivity of the wire of the coil
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123
A current carrying conductor is held in exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor:
A
From top to bottom
B
From right to left
C
From left to right
D
From bottom to top
View Answer
Answer: From top to bottom
124
The north pole of Earth’s magnet is in the:
A
Geographical South
B
Geographical North
C
Geographical East
D
Geographical West
View Answer
Answer: Geographical South
125
The magnetic field lines outside a bar magnet:
A
Originate from the North Pole and end at its South Pole
B
Originate from the South pole and end at its West Pole
C
Originate from the South pole and end at its North Pole
D
Originate from the North pole and end at its East Pole
View Answer
Answer: Originate from the North Pole and end at its South Pole
126
If the current flowing through a fixed resistor is halved, the heat produced in it will become:
A
One-half
B
One-fourth
C
Four times
D
Double
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127
At a given time, a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulbs could be switched on in the house at the same time (if they are all connected in parallel)?
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128
Two electric bulbs have resistances in the ratio 1:2. If they are joined in series, the energy consumed in them is in the ratio.
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129
Two appliances of rating 200 watt-250 volts and 100 watt-250 volts are joined in series to a 250 volts supply. Total power consumed in the circuit is
A
67 watt
B
30 watt
C
46 watt
D
10 watt
View Answer
130
Keeping the potential difference constant, the resistance of the circuit is halved. The current will become:
A
Double
B
Half
C
One-fourth
D
Four times
View Answer
131
What is the amount of current flowing through an electric press, if the amount of charge passing through a conductor in 10 minutes is 300 C?
A
5 A
B
0.5 A
C
30 A
D
0.3 A
View Answer
132
The process by which energy is produced in the sun is
A
Nuclear fusion
B
Nuclear fission
C
Both nuclear fusion and fission
D
Combustion of hydrogen
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133
The major constituent of biogas is
A
Butane
B
Ethane
C
Propane
D
Methane
View Answer
134
The radiation present in the sunlight that gives us the feeling of hotness is
A
Infra-red
B
Ultra-violet
C
Visible radiation
D
Red
View Answer
135
The energy efficient device for producing light is:
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136
The disposal of wastes produced in a nuclear power plant is a big problem because it is:
A
Too heavyn
B
Highly radioactive
C
Highly inflammable
D
Extremely foul smelling
View Answer
Answer: Highly radioactive
137
How many joules are there in 1eV?
A
1.6 × 10-13 J
B
9.1 × 10-31 J
C
1.6 × 10-19 J
D
None of these
View Answer
138
The rise of sea-water during high tide is caused by the gravitational pull of the:
A
Moon
B
Mars
C
Sun
D
Earth
View Answer
139
Which of the followings is not a fossil fuel?
A
Nuclear fuel
B
Natural gas
C
Coal
D
Petroleum
View Answer
140
In order to make efficient solar cooker, the cover of cooker box should be made of:
A
Transparent glass
B
Butter paper sheet
C
Transparent plastic sheet
D
Shining aluminium sheet
View Answer
Answer: Transparent glass
