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CBSE Class 10 Science Quiz | CBSE Class 10 Science Objective Type Questions with Answers

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

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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
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
Answer: One-fourth
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
Answer: 293
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
Answer: 1:2
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
Answer: 67 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
Answer: Double
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
Answer: 0.5 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
Answer: Nuclear fusion
133 The major constituent of biogas is
[A] Butane
[B] Ethane
[C] Propane
[D] Methane
Answer: 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
Answer: Infra-red
135 The energy efficient device for producing light is:
[A] CFL
[B] LPG
[C] DLF
[D] FCL
Answer: CFL
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
Answer: 1.6 × 10-19 J
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
Answer: Moon
139 Which of the followings is not a fossil fuel?
[A] Nuclear fuel
[B] Natural gas
[C] Coal
[D] Petroleum
Answer: Nuclear fuel
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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