General Science - MCQ Practice Questions

Which phenomenon explains the blue color of the sky?

A 5 kg mass is attached to a spring with spring constant 200 N/m. What is the period of oscillation?

A 1000 W heater operates at 250 V. What is its resistance?

Which of the following best explains why objects appear to move slower underwater?

A satellite orbits Earth at radius r with orbital velocity v. If the orbital radius is doubled, what happens to the orbital velocity?

A photon with frequency 5 × 10¹⁴ Hz is incident on a metal with work function 2 eV. What is the maximum kinetic energy of the photoelectron? (h = 6.63 × 10⁻³⁴ J·s, 1 eV = 1.6 × 10⁻¹⁹ J)

Which statement about acoustic impedance is correct?

Which of the following is the SI unit of electric potential?

A convex lens has a focal length of 15 cm. An object is placed 30 cm from the lens. Where will the image form?

Which phenomenon is responsible for the reddish appearance of the Sun at sunset?

A car accelerates from rest at 2 m/s². How long does it take to reach 20 m/s?

Which of the following statements about gravitational force is correct?

A concave mirror has a focal length of 10 cm. An object is placed 5 cm from the mirror. What type of image is formed?

Two resistances of 10 Ω and 20 Ω are connected in parallel. What is the equivalent resistance?

A sound wave has a frequency of 440 Hz and travels at 330 m/s in air. What is its wavelength?

When a spring is compressed by 0.1 m, the elastic potential energy stored is 5 J. What is the spring constant?

Which of the following correctly describes the photoelectric effect?

A moving object has kinetic energy K. If its velocity is doubled, what will be its new kinetic energy?

Which law of thermodynamics explains why heat cannot spontaneously flow from a colder body to a hotter body?

A ball is thrown vertically upward with initial velocity 20 m/s. What maximum height does it reach? (g = 10 m/s²)