NEET Questions

🎯Difficulty :Easy

🔄Ncert Concepts :Spring Energy, Potential Energy, Hooke's Law

92.

A spring stores 4 J of potential energy when compressed by 0.1 m. What is its spring constant?

40 N/m

80 N/m

400 N/m

800 N/m

Question Tags

🎯Difficulty :Easy

🔄Ncert Concepts :Spring Energy, Potential Energy, Hooke's Law

93.

A particle of mass $m$ is projected vertically upwards with a velocity $v$ . If the air resistance is proportional to the square of the velocity, given by $kv^2$ , where $k$ is a positive constant, what is the maximum height reached by the particle?

$\frac{m}{k} \ln(1 + \frac{kv_0^2}{mg})$

$\frac{m}{2k} \ln(1 + \frac{kv_0^2}{2mg})$

$\frac{m}{2k} \ln(1 + \frac{kv_0^2}{mg})$

$\frac{m}{k} \ln(1 + \frac{2kv_0^2}{mg})$

Question Tags

🎯Topic:Power

🎯Difficulty :Hard

⚡ Time Required :3 mins

🔄Ncert Concepts :Power, Work, Energy, Calculus, Kinematics

94.

A body of mass $m$ is lifted to a height $h$ in time $t$ with constant velocity. The instantaneous power delivered by the lifting force at time $t/2$ is:

$mgh/t$

$mgh/(2t)$

$2mgh/t$

$mgh$

Question Tags

🎯Topic:Power

🎯Difficulty :Hard

⚡ Time Required :2 mins

🔄Ncert Concepts :Power, Work, Energy

95.

A particle of mass $m$ moves in a circular orbit of radius $r$ under the influence of a central force whose potential energy is given by $U(r) = kr^3$ , where $k$ is a constant. The angular momentum of the particle is:

$m\sqrt{kr^4}$

$m\sqrt{2kr^4}$

$m\sqrt{3kr^4}$

$m\sqrt{4kr^4}$

Question Tags

📑 Chapter:Systems Of Particles And Rotational Motion

🎯Topic:Angular Momentum And Conversation Of Angular Momentum

🎯Difficulty :Hard

⚡ Time Required :3 mins

🔄Ncert Concepts :Angular Momentum, Central Force, Potential Energy

96.

A spring of spring constant $k$ is compressed by a distance $x$ . If the spring is cut into two equal halves and one half is compressed by the same distance $x$ , what is the potential energy stored in the compressed half-spring?

$\frac{1}{4}kx^2$

$2\frac{1}{2}kx^2$

$\frac{1}{2}kx^2$

$kx^2$

Question Tags

🎯Difficulty :Medium

🔄Ncert Concepts :spring energy, spring constant

97.

Two identical springs, each with spring constant $k$ , are connected in series. What is the effective spring constant of the combination?

$2k$

$k$

$k/2$

$4k$

Question Tags

🎯Difficulty :Medium

🔄Ncert Concepts :spring energy, spring constant, series combination

98.

A block of mass $m$ is attached to a spring with spring constant $k$ . The block is pulled a distance $A$ from its equilibrium position and released. What is the maximum speed of the block during its oscillation?

$A\sqrt{\frac{m}{k}}$

$\frac{1}{2}kA^2$

$A\sqrt{\frac{k}{m}}$

$\frac{kA}{m}$

Question Tags

🎯Difficulty :Medium