1
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

Which of the following diagram represents the variation of the electric field with distance r from the centre of a uniformly charged non-conducting sphere of radius R?

A
COMEDK 2022 Physics - Electrostatics Question 22 English Option 1
B
COMEDK 2022 Physics - Electrostatics Question 22 English Option 2
C
COMEDK 2022 Physics - Electrostatics Question 22 English Option 3
D
COMEDK 2022 Physics - Electrostatics Question 22 English Option 4
2
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

A DC ammeter and a hot wire ammeter are connected to a circuit in series. When a direct current is passed through circuit, the DC ammeter shows 6 A. When AC current flows through circuit, what is the average readings in DC ammeter and the AC ammeter, if DC and AC currents flows simultaneously through the circuit?

A
DC = 6 A, AC = 10 A
B
DC = 3 A, AC = 5 A
C
DC = 5 A, AC = 8 A
D
DC = 2 A, AC = 3 A
3
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

A bullet of mass $m$ hits a mass $$M$$ and gets embedded in it. If the block rises to a height $$h$$ as a result of this collision, the velocity of the bullet before collision is

A
$$v=\sqrt{2 g h}$$
B
$$v=\sqrt{2 g h}\left[1+\left(\frac{m}{M}\right)\right]$$
C
$$v=\sqrt{2 g h}\left(1+\sqrt{\frac{M}{m}}\right)$$
D
$$v=\sqrt{2 g h}\left[1-\left(\frac{m}{M}\right)\right]$$
4
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

A particle of mass $$m$$ is moving in a horizontal circle of radius $$r$$ under a centripetal force given by $$\left(\frac{-K}{r^2}\right)$$, where $$K$$ is a constant. Then

A
the total energy of the particle is $$\left(\frac{-K}{2 r}\right)$$
B
the kinetic energy of the particle is $$\left(\frac{K}{r}\right)$$
C
the potential energy of the particle is $$\left(\frac{K}{2 r}\right)$$
D
the kinetic energy of the particle is $$\left(\frac{-K}{r}\right)$$
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