Physics Test 28
Total Questions: 25
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A ) The output voltage is higher ✅
B ) The power consumption is less
C ) The total output is almost constant
D ) The output of a 3-phase machine is greater than that of a single phase machine
A ) Applying lubricants to the balls used
B ) Reducing the area of contact with the use of metallic balls ✅
C ) Increasing the ara of contact with the use of metallic balls
D ) None of these
A ) Electrical energy can be converted into chemical energy in the presence of magnetic fields
B ) A conductor carrying current in the direction perpendicular to the external magnetic field feels a force ✅
C ) The current flowing through a conductor causes generation of heat that drives the engine
D ) Changing magnetic field induces an electromotive force in a conductor
A ) It converts chemical energy into electrical energy
B ) It converts magnetic energy into electrical energy
C ) It converts light energy into electrical energy ✅
D ) It converts electrical energy into light energy
A ) Flow of molecules ✅
B ) Flow of electrons
C ) Flow of photons
D ) All are true
A ) More kinetic energy
B ) More potential energy
C ) Less kinetic energy ✅
D ) More mechanical energy
A ) Friction between the earth and the bus
B ) Friction between the passengers and the earth
C ) Inertia of the passengers ✅
D ) Inertia of the bus
A ) Plane and convex mirrors ✅
B ) Plane mirrors alone.
C ) Concave and convex mirrors.
D ) Concave mirrors alone.
A ) Change in magnetization of an electromagnet, which causes a diaphragm to vibrate.
B ) Efficiency of the loudspeaker which enhances the loudness of sound
C ) Conversion of electric signal, after its amplification into sound wave
D ) Diaphragm which is made to vibrate by the incoming sound wave ✅
A ) L is large and p is large
B ) L is small and p is a large ✅
C ) L is large and p is small
D ) L is small and p is small
A ) Archimedes principle
B ) Toricellian law
C ) Bernoulli's theorem
D ) Pascal's law ✅
A ) Sound and video signals are transmitted simultaneously ✅
B ) Sound is transmitted first and then the video signal follows
C ) Video signal is transmitted first, followed by sound signal
D ) Sound and video signals are transmitted from different places at the same time
A ) Adhesive force between the molecules
B ) Cohesive force between the molecules ✅
C ) Gravitational force between the molecules
D ) Electrical force between the molecules
A ) More durable than rubber
B ) Less expensive than rubber in the long run
C ) Less elastic than rubber
D ) More elastic than rubber ✅
A ) It is due to decrease in humidity in air
B ) It is due to the rise in atmospheric pressure
C ) It is due to the fall in atmospheric pressure ✅
D ) It is due to the severe heat energy from the sun
A ) There is lesser dissipation of heat at higher altitudes
B ) Water available at higher altitudes is purer than that in the plains
C ) Pollution -free air at higher altitudes increases the calorific value of fuel used
D ) The atmospheric pressure at higher altitudes is low as compared to that at sea level ✅
A ) Air
B ) Glass ✅
C ) Water
D ) Wood
A ) Absorption of sound
B ) Dispersion of sound
C ) Reflection of sound ✅
D ) Refraction of sound
A ) Eract and real
B ) Inverted and real ✅
C ) Imaginary and erect
D ) The type of image formed will depend on the distance between the lens and the object
A ) At the speed of sound
B ) At seven times the speed of sound
C ) At half the speed of light
D ) Nearly at speed of light ✅
A ) East-West
B ) North-East
C ) North-South ✅
D ) South-East
A ) For protection against the effect of external magnetic fields ✅
B ) For guarding the instruments against unauthorised handling
C ) For protection against the effect of moisture in the air
D ) For absorbing heat generated during the functioning of the instrument
A ) Because they speed up transmission
B ) Because they can conserve electrical energy
C ) Because they can reduce transmission losses ✅
D ) Because they can help to distribute electrical energy efficiently
A ) Nitrogen and Argon
B ) Nitrogen and Oxygen
C ) Oxygen and Argon ✅
D ) Oxygen and Hydrogen
A ) Higher density of the salty water ✅
B ) Higher density of the pure water
C ) The fluid matter inside the egg-shell
D ) The fact that the egg-shell is made of calcium which is heavier than pure water