Q: A block of mass $$m$$ slides down a rough inclined plane of angle $$\theta$$ with a coefficient of kinetic friction $$\mu_k. $$What is the acceleration of the block?

$$g(\sin\theta - \mu_k \cos\theta)$$

Question 1

A satellite is orbiting the Earth at a height where the acceleration due to gravity is $$g/4. If $$the radius of the Earth is $$R$$, what is the orbital radius of the satellite?

Accepted Answer

$$2R$$

Question 2

A block of mass $$m$$ slides down a rough inclined plane of angle $$	heta$$ with a coefficient of kinetic friction $$\mu_k. $$What is the acceleration of the block?

Accepted Answer

$$g(\sin	heta - \mu_k \cos	heta)$$

Question 3

A gas is compressed isothermally. Which of the following statements is correct regarding the internal energy and work done?

Accepted Answer

Internal energy remains constant, work is done on the gas

Question 4

A wire of length $$L$$ and radius $$r is $$stretched by a force $$F. If $$Young's modulus of the material is $$Y$$, what is the extension $$\Delta L$$?

Accepted Answer

$$\Delta L = \frac{FL}{\pi r^2$ Y}$$

Question 5

A parallel plate capacitor is filled with a dielectric of dielectric constant $$K. If $$the original capacitance was $$C_0$$, what is the new capacitance?

Accepted Answer

$$KC_0$$

Question 6

A current $$I$$ flows through a long straight wire. What is the magnetic field at a distance $$r$$ from the wire?

Accepted Answer

$$\frac{\mu_0$ I}{2\pi r}$$

Question 7

A convex lens of focal length $$f is $$placed in contact with a concave lens of focal length $$-2f. $$What is the effective focal length of the combination?

Accepted Answer

Question 8

A radioactive sample has a half-life of 10 days. What fraction of the original sample remains after 30 days?

Accepted Answer

$$\frac{1}{8}$$

Question 9

A ball is thrown horizontally from the top of a tower with speed $$u. If $$the height of the tower is $$h$$, what is the time taken to reach the ground?

Accepted Answer

$$\sqrt{\frac{2h}{g}}$$

Question 10

A simple pendulum has a length $$l$$ and is placed in a region where the acceleration due to gravity is $$g. $$What is its time period?

Accepted Answer

$$2\pi \sqrt{\frac{l}{g}}$$

Question 11

A car of mass $$m$$ moves with velocity $$v on a $$circular track of radius $$r. $$What is the minimum coefficient of friction required to prevent slipping?

Accepted Answer

$$\frac{v^2$}{rg}$$

Question 12

A body of mass $$m is $$attached to a spring of force constant $$k$$ and oscillates with amplitude $$A. $$What is the total energy of the system?

Accepted Answer

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

Question 13

A charge $$q is $$placed at the center of a cube of side $$a. $$What is the electric flux through one face of the cube?

Accepted Answer

$$\frac{q}{6\$$varepsilon_0$$}$$

Question 14

A transformer is used to step up the voltage from 220 V to 2200 V. If the primary coil has 100 turns, how many turns should the secondary coil have?

Accepted Answer

1000

Question 15

A monochromatic light of wavelength $$\lambda$$ passes through a single slit of width $$a. $$What is the angular width of the central maximum in the diffraction pattern?

Accepted Answer

$$2\sin$$^{-1}$$\left(\frac{\lambda}{a}\right)$$

Question 16

A proton and an alpha particle are accelerated through the same potential difference. What is the ratio of their final kinetic energies?

Accepted Answer

1:2

Question 17

A Zener diode is used as a voltage regulator. If the input voltage increases, what happens to the current through the Zener diode?

Accepted Answer

It increases

Question 18

A logic circuit has two inputs A and B and gives an output only when both A and B are 1. Which logic gate is this?

Accepted Answer

AND gate

Question 19

A student uses a meter bridge to determine the resistance of a wire. If the balancing length is $$l$$ and the known resistance is $$R$$, what is the unknown resistance $$X$$?

Accepted Answer

$$X = R \frac{l}{100-l}$$

NEET UG 2025 Physics Syllabus: Structured Study Notes

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