Physics Quiz

A block of mass 5 kg is placed on a rough horizontal surface. A force of 20 N is applied horizontally to the block. If the frictional force opposing the motion is 10 N, what is the acceleration of the block?

• A) 2 m/s²

• B) 3 m/s²

• C) 4 m/s²

• D) 5 m/s²

A converging lens has a focal length of 10 cm. An object is placed 20 cm in front of the lens. What is the nature (real or virtual) and position of the image formed by the lens?

• A) Real and at 5 cm in front of the lens

• B) Real and at 20 cm in front of the lens

• C) Virtual and at 5 cm behind the lens

• D) Virtual and at 20 cm behind the lens

A car of mass 1200 kg is moving with a velocity of 15 m/s. If a constant force of 3000 N is applied in the direction of motion, what is the speed of the car after 10 seconds?

• A) 75 m/s

• B) 50 m/s

• C) 25 m/s

• D) 15 m/s

A block of mass 2 kg is moving in a circle of radius 4 meters at a constant speed of 8 m/s. What is the magnitude of the centripetal acceleration acting on the block?

• A) 4 m/s²

• B) 8 m/s²

• C) 16 m/s²

• D) 32 m/s²

A wire of resistance 4 ohms is stretched to double its original length, while keeping its cross-sectional area constant. What is the new resistance of the wire?

• A) 8 ohms

• B) 4 ohms

• C) 16 ohms

• D) 2 ohms

A parallel plate capacitor is connected to a 12 V battery. If the separation between the plates is increased, what happens to the capacitance of the capacitor?

• A) The capacitance decreases

• B) The capacitance remains the same

• C) The capacitance increases

• D) The capacitance depends on the area of the plates

A particle is moving in a straight line with a constant acceleration. It starts from rest and covers a distance of 100 meters in 10 seconds. What is the magnitude of its acceleration?

• A) 1 m/s²

• B) 2 m/s²

• C) 3 m/s²

• D) 4 m/s²

A ray of light passes from air into a glass block. What happens to the speed and wavelength of the light when it enters the glass?

• A) The speed and wavelength increase

• B) The speed decreases and wavelength decreases

• C) The speed increases and wavelength decreases

• D) The speed decreases and wavelength increases

A block of mass 4 kg is placed on an inclined plane that makes an angle of 30 degrees with the horizontal. If the coefficient of friction between the block and the inclined plane is 0.2, what is the force of friction acting on the block?

• A) 8 N

• B) 16 N

• C) 4 N

• D) 12 N

A block of mass 6 kg is suspended by a rope. If the tension in the rope is 60 N, what is the acceleration of the block? (Assume g = 9.8 m/s²)

• A) 1.0 m/s²

• B) 10 m/s²

• C) 9.8 m/s²

• D) 0.98 m/s²