Focus Guide for 12th Physics. We covered all the Focus Guide for 12th Physics MCQs in this post for free so that you can practice well for the exam.
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Focus Guide for 12th Physics Objective for Students
Which one among the following doesn’t have any effect on the velocity of sound?
(a) Pressure
(b) Temperature
(c) Humidity
(d) Density
Option a – Pressure
Sound waves are similar to the waves:
(a) of laser light passing through the air
(b) generated in a stretched wire by hitting or plucking the wire
(c) generated in a pipe filled with air by moving the piston attached to the pipe up and down
(d) generated by the mobile phone towers
Option c – generated in a pipe filled with air by moving the piston attached to the pipe up and down
Planet A has double the radius than that of Planet B. If the mass of Planet A is 4 times heavier than the mass of Planet B, which of the following statements regarding the weight of an object is correct?
(a) Heavier on Planet A than on Planet B
(b) Heavier on Planet B than on Planet A
(c) Same on both the Planets
(d) Cannot be measured on Planet B
Option c – Same on both the Planets
A fuse is used in an electric circuit to:
(a) break the circuit when excessive current flows through the circuit
(b) break the circuit when the power goes off
(c) indicate if the current is flowing uninterrupted
(d) complete the circuit for the flow of current
Option a – break the circuit when excessive current flows through the circuit
In optical instruments, the lenses are used to form an image by the phenomenon of:
(a) reflection
(b) refraction
(c) scattering
(d) diffusion
Option b – refraction
The motion of a body around a circular path is an example of:
(a) Uniform velocity, variable acceleration
(b) Uniform speed, uniform velocity
(c) Uniform speed, variable velocity
(d) Uniform speed, variable acceleration
Option c – Uniform speed, variable velocity
A current-carrying conductor is associated with:
(a) a magnetic field
(b) an electric field
(c) an electromagnetic field
(d) an electrostatic field
Option a – a magnetic field
The linear expansion of a solid rod is independent of its:
(a) initial length
(b) material
(c) increase in temperature
(d) time of heat flow
Option d – time of heat flow
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