1
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1

A bob is whirled in a horizontal circle by means of a string at an initial speed of $$10 \mathrm{~rpm}$$. If the tension in the string is quadrupled while keeping the radius constant, the new speed is:

A
20 rpm
B
40 rpm
C
5 rpm
D
10 rpm
2
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1

Let $$\omega_1, \omega_2$$ and $$\omega_3$$ be the angular speed of the second hand, minute hand and hour hand of a smoothly running analog clock, respectively. If $$x_1, x_2$$ and $$x_3$$ are their respective angular distances in 1 minute then the factor which remains constant $$(k)$$ is

A
$$\frac{\omega_1}{x_1}=\frac{\omega_2}{x_2}=\frac{\omega_3}{x_3}=k$$
B
$$\omega_1 x_1=\omega_2 x_2=\omega_3 x_3=k$$
C
$$\omega_1 x_1^2=\omega_2 x_2^2=\omega_3 x_3^2=k$$
D
$$\omega_1^2 x_1=\omega_2^2 x_2=\omega_3^2 x_3=k$$
3
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1

A ball is projected from point A with velocity $$20 \mathrm{~m} \mathrm{~s}^{-1}$$ at an angle $$60^{\circ}$$ to the horizontal direction. At the highest point $$\mathrm{B}$$ of the path (as shown in figure), the velocity $$\mathrm{v} \mathrm{m} \mathrm{s}^{-1}$$ of the ball will be:

A
20
B
$$10 \sqrt{3}$$
C
Zero
D
10
4
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1

A particle is executing uniform circular motion with velocity $$\vec{v}$$ and acceleration $$\vec{a}$$. Which of the following is true?

A
$$\vec{v}$$ is a constant; $$\vec{a}$$ is not a constant
B
$$\vec{v}$$ is not a constant; $$\vec{a}$$ is not a constant
C
$$\vec{v}$$ is a constant; $$\vec{a}$$ is a constant
D
$$\vec{v}$$ is not a constant; $$\vec{a}$$ is a constant
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