1
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The magnetic flux linked with a coil satisfies the relation $$\phi=\left(4 t^2+6 t+9\right) \mathrm{Wb}$$, where $$t$$ is time in second. The emf induced in the coil at $$t=2 \mathrm{~s}$$ is

A
22 V
B
18 V
C
16 V
D
40 V
2
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The instantaneous values of alternating current and voltages in a circuit given as

$$\begin{aligned} & i=\frac{1}{\sqrt{2}} \sin (100 \pi t) \mathrm{amp} \\ & e=\frac{1}{\sqrt{2}} \sin (100 \pi t+\pi / 3) \text { volt } \end{aligned}$$

The average power (in watts) consumed in the circuit is

A
$$\frac{1}{4}$$
B
$$\frac{\sqrt{3}}{4}$$
C
$$\frac{1}{2}$$
D
$$\frac{1}{8}$$
3
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A car is moving towards a high cliff. The car driver sounds a horn of frequency $$f$$. The reflected sound heard by the driver has a frequency $$2 f$$. If $$v$$ be the velocity of sound, then the velocity of the car in the same velocity units, will be

A
$$\frac{v}{\sqrt{2}}$$
B
$$\frac{v}{3}$$
C
$$\frac{v}{4}$$
D
$$\frac{v}{2}$$
4
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

If escape velocity on earth surface is $$11.1 \mathrm{~kmh}^{-1}$$, then find the escape velocity on moon surface. If mass of moon is $$\frac{1}{81}$$ times of mass of earth and radius of moon is $$\frac{1}{4}$$ times radius of earth.

A
$$2.46 \mathrm{~kmh}^{-1}$$
B
$$3.46 \mathrm{~kmh}^{-1}$$
C
$$4.4 \mathrm{~kmh}^{-1}$$
D
None of these
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