1. What is the difference between an AC and DC current?
Answer: AC (alternating current) changes direction periodically, while DC (direct current) flows in only one direction.
2. What is the formula for electric power?
2. What is the formula for electric power?
Answer: The formula for electric power is P = IV, where P is power, I is current, and V is voltage.
3. What is the difference between nuclear fission and nuclear fusion?
3. What is the difference between nuclear fission and nuclear fusion?
Answer: Nuclear fission involves splitting a large nucleus into two or more smaller ones, while nuclear fusion involves combining two or more smaller nuclei into a larger one.
4. What is the law of reflection?
4. What is the law of reflection?
Answer: The law of reflection states that the angle of incidence is equal to the angle of reflection.
5. What is the difference between convex and concave lenses?
5. What is the difference between convex and concave lenses?
Answer: Convex lenses converge light rays, while concave lenses diverge light rays.
6. What is the formula for Coulomb's law?
6. What is the formula for Coulomb's law?
Answer: Coulomb's law states that F = kq1q2/r^2, where F is the force of attraction or repulsion, q1 and q2 are the magnitudes of the charges, r is the distance between them, and k is the Coulomb constant.
7. What is the difference between reflection and refraction?
7. What is the difference between reflection and refraction?
Answer: Reflection involves bouncing of light rays off a surface, while refraction involves the bending of light rays as they pass through a medium of different density.
8. What is the formula for the wavelength of a wave?
8. What is the formula for the wavelength of a wave?
Answer: The formula for the wavelength (λ) of a wave is λ = v/f, where v is the velocity of the wave and f is its frequency.
9. What is the difference between frequency and period?
9. What is the difference between frequency and period?
Answer: Frequency is the number of cycles of a wave that occur per second, while period is the time taken for one complete cycle of a wave.
10. What is the formula for the capacitance of a capacitor?
10. What is the formula for the capacitance of a capacitor?
Answer: The formula for the capacitance (C) of a capacitor is C = Q/V, where Q is the charge stored and V is the voltage across it.
11. What is the difference between a conductor and a semiconductor?
11. What is the difference between a conductor and a semiconductor?
Answer: Conductors have very low resistance to the flow of electric current, while semiconductors have moderate resistance.
12. What is the formula for the speed of sound in a medium?
12. What is the formula for the speed of sound in a medium?
Answer: The formula for the speed of sound (v) in a medium is v = fλ, where f is the frequency of the sound wave and λ is its wavelength.
13. What is the difference between a concave and convex mirror?
13. What is the difference between a concave and convex mirror?
Answer: A concave mirror converges light rays, while a convex mirror diverges light rays.
14. What is the formula for torque?
14. What is the formula for torque?
Answer: The formula for torque (τ) is τ = Frsinθ, where F is the force applied, r is the distance between the axis of rotation and the point where the force is applied, and θ is the angle between the force and the lever arm.
15. What is the difference between power and energy?
15. What is the difference between power and energy?
Answer: Power is the rate at which energy is transferred or transformed, while energy is the ability to do work.
16. What is the formula for the magnification of a lens or mirror?
16. What is the formula for the magnification of a lens or mirror?
Answer: The formula for the magnification (m) of a lens or mirror is m = -di/do, where di is the distance of the image from the lens or mirror and do is the distance of the object from the lens or mirror.
17. What is the difference between an open and closed circuit?
17. What is the difference between an open and closed circuit?
Answer: An open circuit is one in which the path of electric current is
18. What is the difference between a series and parallel circuit?
Answer: In a series circuit, components are connected end-to-end, while in a parallel circuit, components are connected side-by-side.
19. What is the formula for the force of gravity?
19. What is the formula for the force of gravity?
Answer: The formula for the force of gravity (F) is F = Gm1m2/r^2, where G is the gravitational constant, m1 and m2 are the masses of the objects, and r is the distance between them.
20. What is the difference between a conductor and an insulator?
20. What is the difference between a conductor and an insulator?
Answer: Conductors allow electric current to flow through them easily, while insulators do not allow electric current to flow through them easily.
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