Physics - Online Test
Q1. Davisson Germer experiment proves that
Answer : Option B
Explaination / Solution:
No Explaination.
Q2. Attenuation is
Answer : Option D
Explaination / Solution:
Attenuation is a general term that refers to any reduction in the strength of a signal. Attenuation occurs with any type of signal, whether digital or analog. Sometimes calledloss, attenuation is a natural consequence of signal transmission over long distances.
Q3. Centripetal acceleration of a particle moving in a circular path with constant velocity v is given by
Answer : Option D
Explaination / Solution:
A body that moves in a circular motion (of radius R) at constant speed (v) is always being accelerated. The acceleration is at right angles to the direction of motion (towards the center of the circle) and of magnitude
Q4. Power is defined as
Answer : Option C
Explaination / Solution:
Power is the rate of doing work. It is the amount of energy consumed per unit time. Having no direction, it is a scalar quantity. In the SI system, the unit of power is the joule per second (J/s), known as the watt.
The integral of power over time defines the work performed.
if force is constant
Q5. An electric dipole is
Answer : Option C
Explaination / Solution:
An electric dipole is a separation of positive and negative charges. The simplest example of this is a pair of electric charges of equal magnitude but opposite sign, separated by some (usually small) distance. A permanent electric dipole is called an electret
Q6. Shear modulus or modulus of rigidity is
Answer : Option A
Explaination / Solution:
No Explaination.
Q7. The efficiency (η) of a heat engine is defined by (W is the output and Q1 the heat input)
Answer : Option B
Explaination / Solution:
η=WorkDoneHeatInput=WQ1=Q1−Q2Q1
Q8. Which of these statements about Bohr model applied to hydrogen atom correct?
Answer : Option C
Explaination / Solution:
No Explaination.
Q9. Unification in physics refers to
Answer : Option D
Explaination / Solution:
Unification is the act of unifying the different laws valid for different phenomena in to a single theory that explains all the different phenomena.
Q10. The magnitude of the centripetal force is given by
Answer : Option D
Explaination / Solution:
Centripetal force is a force which acts on a body moving in a circular path and is directed towards the Centre around which the body is moving. Any motion in a curved path represents accelerated motion, and requires a force directed toward the center of curvature of the path. This force is called the centripetal force which means "center seeking" force.
The force has the magnitude
