What is the magnetic force on a unit positive charge moving at unit velocity perpendicular to a magnetic field called?
Correct answer D. Magnetic induction
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Everyday Science MCQs
Page 168 of Everyday Science multiple-choice questions with answers. Tap an option to check yourself.
Page 168 of 198
What is the overall charge on an n-type semiconductor?
Correct answer C. Neutral
What are the charge carriers in a semiconductor?
Correct answer B. Both electrons and holes
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In which type of material can holes exist?
Correct answer C. Semiconductors
Many semiconductors crystallise in which type of structure?
Correct answer C. Face centred cubic
What are electrons in the conduction band free to do?
Correct answer C. Transport charge
What is an empty or partially filled energy band called?
Correct answer C. Conduction band
In a simple cubic unit cell, where are the atoms or molecules located?
Correct answer B. Eight corners
What is the breaking of a crystal along definite directions called?
Correct answer C. Cleavage
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Bulk properties of materials, such as the way they fracture, can be related to their what?
Correct answer B. Microstructure
Coercive force opposes which process?
Correct answer C. Demagnetisation
What happens at the Curie temperature?
Correct answer C. Ferromagnetic materials become paramagnetic
What is any change in the shape, length or volume of a body caused by an external force called?
Correct answer A. Deformation
What are materials called that undergo plastic deformation before they break?
Correct answer A. Ductile
A uniform steel wire 4 m long with a cross-sectional area of 3 × 10⁻⁶ m² is stretched by 1 mm. If Young’s modulus of steel is 2 × 10¹¹ N m⁻², how much energy is stored in the wire?
Correct answer B. 0.075 J
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A rubber cord 1 m long has a cross-sectional area of 2 cm². A tensile force of 10 N stretches it by 1 cm. What is the Young’s modulus of the rubber?
Correct answer A. 5 × 10⁶ N m⁻²
What is the SI unit of the modulus of elasticity?
Correct answer D. N m⁻²
What represents the energy needed to magnetise and demagnetise a material?
Correct answer B. Hysteresis loop area
Which device is used to detect extremely weak magnetic fields?
Correct answer B. SQUIDs
According to the band theory of solids, what kind of band structure does a semiconductor have?
Correct answer D. A completely filled valence band, a partially filled conduction band and a narrow forbidden band