ETEA MDCAT PAPER 2023

( PART 11 )

1. The wavelength of photon “A” is half the wavelength of photon “B”. The energy of a photon “A” is:

 
 
 
 

2. If frequency of light is greater than threshold frequency then in photoelectric effect the number of electrons increases with increase in _____ of light:

 
 
 
 

3. The shortest wavelength associated to Paschen series is:

 
 
 
 

4. The ratio of shortest wavelength to longest of Lyman series is:

 
 
 
 

5. Half-life of a radioactive element is 100 days. How much quantity of the 88g of such element will remain after three half-lives:

 
 
 
 

6. Radioactive Sr has a half-life of 30 years. What percent of a sample of Sr will remain after 90 years

 
 
 
 

7. At the end of 15 min, 1/32 of a sample of radioactive polonium remains. The corresponding half-life is:

 
 
 
 

8. Two equal and opposite charges of 10 C are separated at a distance of 10 cm, the electric potential at mid-point between the charges is:

 
 
 
 

9. The force of repulsion between two alike charges is 10 N in vacuum. When a material of Ep= 2 is placed between them. New force will be:

 
 
 
 

10. The slope-of the charge-time graph for a charging capacitor gives:

 
 
 
 

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