2020 MHT-CET PCB SET - 02 MHT - CET - 2020 MHT-CET PCB SET - 02

The figure shows two diagrams in which diode and resistance are connected. Out of the following statements which one is TRUE?

Diagram (a)

Diagram (b)

• A
  diagram (a) forward biased and diagram (b) reverse biased
  
• B
  diagram (a) and diagram (b) both are reverse biased
  
• C
  diagram (a) and diagram (b) both are forward biased
  
• ✓
  diagram (a) reverse biased and diagram (b) forward biased
  

Answer: D.

For the following combination of logic gates, when all the three inputs are first high and then low, the output 'Y' will respectively be

• A
  1, 1
  
• ✓
  0, 1
  
• C
  0, 0
  
• D
  1, 0
  

Answer: B.

• ✓
  Paschen. Infrared
  
• B
  Brackett, far infrared
  
• C
  Paschen, far infrared
  
• D
  Brackett, near infrared
  

Answer: A.

• A
  $\frac{2 e ^2 \varepsilon_0}{ hc }$
• ✓
  $\frac{ e ^2}{2 \varepsilon_0 hc }$
• C
  $\frac{ e ^3}{2 \varepsilon_0 hc }$
• D
  $\frac{2 \varepsilon_0 hc }{ e ^2}$

Answer: B.

• ✓
  $\frac{v^2}{2\left(\frac{e}{m}\right)}$
• B
  $\frac{v^2}{\left(\frac{m}{e}\right)}$
• C
  $\frac{v^2}{\left(\frac{e}{m}\right)}$
• D
  $\frac{v^2}{2\left(\frac{m}{e}\right)}$

Answer: A.