Physics - Online Test
Q1. Photons can be
Answer : Option D
Explaination / Solution:
If photon strike with loosely bound electron then photoelectric effect takes place.Collision of photon with completely free electron give rise to Compton effect or Compton scattering.
Q2. FM Radio set used in cars is
Answer : Option D
Explaination / Solution:
Radio means sending energy with waves. In other words, it's a method of transmitting electrical energy from one place to another without using any kind of direct, wired connection. That's why it's often called wireless. The equipment that sends out a radio wave is known as a transmitter; the radio wave sent by a transmitter whizzes through the air—maybe from one side of the world to the other—and completes its journey when it reaches a second piece of equipment called a receiver((here a radio).
Q3. if particles A and B are moving with velocities and (each with respect to some common frame of reference, say ground.). Then, velocity of particle A relative to that of B is:
Answer : Option B
Explaination / Solution:
The relative velocity of an object A with respect to another object B is the velocity that object A would appear to have to an observer situated on object B moving along with it.
In simple words relative velocity of A with respect to Be is the vector difference between the velocities of A and B.
It is represented as
Q4. The potential energy of a spring whose spring constant is k and is compressed by x is
Answer : Option B
Explaination / Solution:
If a spring is stretched or compressed by a distance x from its natural length under the action of restoring force then
F = -kx
dU=−F.dx
Q5. Electric field lines can be said to be
Answer : Option A
Explaination / Solution:
Electric Field Lines can be defined as a curve which shows direction of electric field, when we draw tangent at its point. The concept of electric field was proposed by Michael Faraday, in the 19th century. He always thought that electric field lines can be used to describe and interpret the invisible electric field. Instead of using complex vector diagram every time, This pictorial representation or form is called electric field lines.
Electric field lines can be used to describe electric field around a system of charges in a better way.
Q6. Elastomers are materials
Answer : Option D
Explaination / Solution:
No Explaination.
Q7. In which type of process is the volume constant
Answer : Option D
Explaination / Solution:
An isochoric process is a thermodynamic process during which the volume of the closed system undergoing such a process remains constant.
Q8. Which of these statements about Bohr model hypothesis is correct?
Answer : Option C
Explaination / Solution:
No Explaination.
Q9. Scientists strategy in general is to
Answer : Option C
Explaination / Solution:
It is not practical to take into account all the complexities of a phenomenon in one go.
A good and scientific strategy is to focus first on the essential features, discover the basic principles and then introduce corrections to build a more refined theory of the phenomenon by removing its less significant aspects.
Q10. Friction is
Answer : Option B
Explaination / Solution:
Whenever a body of mass m moves or tends to move over the surface of another body, then the opposite force acts parallel to the surface contact which opposes the relative motion.
