General Physics Questions And Answers


Q1. 
Why is a fusion reaction difficult to perform?

Ans.
Repulsion between the nuclei


Q2. 
Which of the following substances cannot be emitted by radioactive substances during their decay?

Ans.
Protons


Q3. 
The electron emitted in β – radiation originates from where?

Ans.
The decay of a neutron in nuclei


Q4. 
Emission of β-rays in radioactive decay results in the change of either mass or charge.

Ans.
False


Q5. 
What will happen in a time of 7 hours, if a radioactive substance has an average life of 7 hours?

Ans.
More than half of the active nuclei decay


Q6. 
Crystalline solids are which of the following?

Ans.
Anisotropic


Q7. 
Which of the following is an amorphous solid?

Ans.
Glass


Q8. 
At which temperature, a pure semiconductor behaves slightly as a conductor?

Ans.
High temperature


Q9. 
An intrinsic semiconductor, at the absolute zero temperature, behaves like which one of the following?

Ans.
Insulator


Q10. 
Holes are charge carriers in which semiconductors?

Ans.
Intrinsic semiconductors