General Science - MCQ Practice Questions

A submarine sonar uses ultrasound with frequency 50 kHz and speed 1500 m/s in water. What is the wavelength?

A conducting sphere is given a charge of 8 μC. What is the electric field at its surface if the radius is 2 cm?

A Carnot engine operates between temperatures 400 K and 300 K. What is its maximum efficiency?

When light passes from a denser to a rarer medium at an angle greater than the critical angle, what happens?

A copper wire is stretched elastically. Which property is NOT affected?

Which of the following statements about velocity is correct?

A ball is thrown vertically upward with an initial velocity of 20 m/s. What is the maximum height reached? (Take g = 10 m/s²)

Which law of motion states that the acceleration of an object is directly proportional to the net force applied and inversely proportional to its mass?

A 2 kg object accelerates at 5 m/s² when a net force is applied. What is the magnitude of the net force?

Two identical objects moving with velocities v and 2v collide and stick together. What fraction of kinetic energy is lost?

A block slides down a frictionless incline of angle 30°. What is its acceleration down the incline?

A spring with spring constant k = 100 N/m is compressed by 0.1 m. What is the elastic potential energy stored?

Which phenomenon occurs when sound waves bend around obstacles?

A light ray travels from air (n=1) into glass (n=1.5) at an incident angle of 30°. What is the refraction angle?

Which color of visible light has the longest wavelength?

Two resistors of 4Ω and 6Ω are connected in series with a 10V battery. What is the total current?

Which of the following is a non-ohmic conductor?

What is the SI unit of magnetic flux?

A transformer has 100 turns in the primary coil and 500 turns in the secondary coil. If the primary voltage is 220V, what is the secondary voltage assuming 100% efficiency?

Which statement about alpha decay is correct?