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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
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
Answer: The resistivity of the wire of the coil
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
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
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
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
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)?
[A]
393
[B]
293
[C]
93
[D]
193
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.
[A]
1:2
[B]
1:1
[C]
2:1
[D]
4:1
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
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
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
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
133
The major constituent of biogas is
[A]
Butane
[B]
Ethane
[C]
Propane
[D]
Methane
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
135
The energy efficient device for producing light is:
[A]
CFL
[B]
LPG
[C]
DLF
[D]
FCL
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
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
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
139
Which of the followings is not a fossil fuel?
[A]
Nuclear fuel
[B]
Natural gas
[C]
Coal
[D]
Petroleum
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
Answer: Transparent glass
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