What is the charge of n type semiconductor?

• Positive

• Negative

• Neutral

• None of the above

A system is said to be defined as non causal, when

• the output at the present depends on the input at an earlier time

• the output at the present does not depend on the factor of time at all

• the output at the present depends on the input at the current time

• the output at the present depends on the input at a time instant in the future

All causal systems must have the component of

• Memory

• Time Invariance

• Stability

• Linearity

What is the total power consumption of this circuit?

• 25mW

• 250mW

• 2.5mW

• 2.5W

For generating a 1 KHz note, which one oscillator is most suitable?

• Hartley

• Colpits

• Radio Frequency

• Wein Bridge

472 on a capacitor represents:

• 4.7nF

• 472nF

• 47nF

• 472pF

Which logic gate is represented by the following combination of logic gates?

• OR

• NAND

• AND

• XOR

What about the stability of the system

• Unstable

• Stable

• Stable at 0.4

• Cannot say

The signal defined by the equations f(t) = 0 for t < 0, f(t) = E for 0 ≤ t ≤ a and f(t) = 0 for t > a is

• Step function

• Pulse function

• Unit Impulse

• Shifted step function

A box has 4 white and 3 red balls. Two balls are taken out in succession. What is the probability that both are white?

• $\frac{4}{7}$

• $\frac{1}{2}$

• $\frac{2}{7}$

• $\frac{1}{7}$