Physics - Online Test

Q1. One of the combinations from the fundamental physical constants is hc/G . The unit of this expression is
Answer : Option A
Explaination / Solution:
No Explaination.


Q2. Electronic communication refers to
Answer : Option B
Explaination / Solution:

When information are sent from one point to the other it has to be converted into electrical signal using transducer.The receiver receives it in its original from using receiver.Such from of communication is called electronic communication.

Q3. The magnetic field at the center O of the following current loop is


Answer : Option A
Explaination / Solution:


Q4. The barrier potential of a silicon diode is approximately,
Answer : Option A
Explaination / Solution:
No Explaination.


Q5. The basic difference between a scalar and vector is one of
Answer : Option B
Explaination / Solution:

Scalar quantity gives you an idea about how much of an object there is, but vector quantity gives you an indication of how much of an object there is and that also in which direction. So, the main difference between these two quantities is associated with the direction, i.e. scalars do not have direction but vectors do.

Q6. Which one of the following Cartesian coordinate systems is not followed in physics?
Answer : Option D
Explaination / Solution:
No Explaination.


Q7. The picture of heat as a fluid was discarded in favor of the modern concept of heat as a form of energy because
Answer : Option C
Explaination / Solution:

If heat were actually a substance, as many scientists of the time believed, it was difficult to see how so much of it could be produced during the boring of a metal cannon. Rumford showed that the amount of heat was not related to the quantity of filings produced

Q8. An electron moves on a straight line path XY as shown in the figure. The coil abcd is adjacent to the path of the electron. What will be the direction of current, if any, induced in the coil?


Answer : Option A
Explaination / Solution:


Q9. Which of the following methods can be used to charge a metal sphere positively without touching it . Select the best
Answer : Option C
Explaination / Solution:

This can be possible by induction, if a negative charge rod is placed near the sphere (at a distance not in touch) than it attracts positive charge inside the sphere towards its side and the negative charges collected on other side and when the surface of sphere connected to earth than the negative charge goes to earth and the sphere remain positively charged.


Q10. A perfectly rigid body is one
Answer : Option A
Explaination / Solution:

A perfectly rigid body is hypothetical in nature but for some phenomena ( in rotational bodies ) we assume bodies are perfectly rigid i.e. the intermolecular forces are always in equilibrium irrespective of the external forces due to which their shape and size are constant.