1
MHT CET 2019 3rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The vectors $(\mathbf{A}+\mathbf{B})$ and $(\mathbf{A}-\mathbf{B})$ are at right. angles to each other. This is possible under the condition

A
$|A|=|B|$
B
$A \cdot B=0$
C
$A \cdot B=1$
D
$A \times B=0$
2
MHT CET 2019 3rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A coil has inductance 2 H . The ratio of its reactance, when it is connected first to an $A C$ source and then to DC source, is

A
zero
B
1
C
less than 1
D
infinity
3
MHT CET 2019 3rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A person measures a time period of a simple pendulum inside a stationary lift and finds it to be $T$. If the lift starts accelerating upwards with an acceleration $\left(\frac{g}{3}\right)$, the time period of the pendulum will be

A
$\frac{T}{\sqrt{3}}$
B
$\sqrt{3} \frac{T}{2}$
C
$\sqrt{3} T$
D
$\frac{T}{3}$
4
MHT CET 2019 3rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A charged conductor produces an electric field of intensity $10^3 \mathrm{~V} / \mathrm{m}$ just outside its surface in vacuum. Then, it produces the electric field of intensity E just outside its surface, when it is placed in a medium of dielectric constant 4. The value of $E$ will be

A
$400 \mathrm{~V} / \mathrm{m}$
B
$450 \mathrm{~V} / \mathrm{m}$
C
$250 \mathrm{~V} / \mathrm{m}$
D
$150 \mathrm{~V} / \mathrm{m}$
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