1
GATE ECE 2020
MCQ (Single Correct Answer)
+2
-0.67

The band diagram of $p$-type semiconductor with a bandgap of the 1 eV is shown. Using this semiconductor, a MOS capacitor having $V_{T H}$ of $-0.16 \mathrm{~V}, C_{o x}^{\prime}$ of $100 \mathrm{nF} / \mathrm{cm}^2$ and metal work function of 3.87 eV is fabricated. There is no charge within the oxide. If the voltage across the capacitor is $V_{T H}$, the magnitude of depletion charge per unit area (in $\mathrm{C} / \mathrm{cm}^2$ ) is

GATE ECE 2020 Electronic Devices and VLSI - IC Basics and MOSFET Question 1 English
A

$1.41 \times 10^{-8}$

B

$0.52 \times 10^{-8}$

C

$0.93 \times 10^{-8}$

D

$1.70 \times 10^{-8}$

2
GATE ECE 2020
MCQ (Single Correct Answer)
+1
-0.33

If $\mathbf{v}_{\mathbf{1}}, \mathbf{v}_{\mathbf{2}} \ldots \mathbf{v}_{\mathbf{6}}$ are six vectors in $\mathbb{R}^4$, which one of the statements is FALSE?

A

Any four of these vectors form a basis for $\mathbb{R}^4$.

B

It is not necessary that these vectors span $\mathbb{R}^4$.

C

If $\left\{\mathbf{v}_1, \mathbf{v}_3, \mathbf{v}_5, \mathbf{v}_6\right\}$ spans $\mathbb{R}^4$, then it forms a basis of $\mathbb{R}^4$.

D

These vectors are not linearly independent.

3
GATE ECE 2020
Numerical
+1
-0

The two sides of a fair coin are labelled as 0 and 1 . The coin is tossed two times independently. Let $M$ and $N$ denote the labels corresponding to the outcomes of those tosses. For a random variable $X$, defined as $X=\min (M, N)$, the expected value $E[X]$ (rounded off to two decimal places) is $\_\_\_\_$ .

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4
GATE ECE 2020
MCQ (Single Correct Answer)
+1
-0.33

The general solution of $\frac{d^2 y}{d x^2}-6 \frac{d y}{d x}+9 y=0$ is

A

$y=C_1 e^{3 x}+C_2 e^{-3 x}$

B

$y=C_1 e^{3 x}$

C

$y=\left(C_1+C_2 x\right) e^{3 x}$

D

$y=\left(C_1+C_2 x\right) e^{-3 x}$