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

Questions
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

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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