Physics quick practice

Question 1 of 10

A circuit breaker differs from a fuse in that it

Question 2 of 10

Radiation needs a medium to travel through.

Question 3 of 10

A 0.5 kg ball moving at 10 m/s is stopped in 0.1 s. What average force stops it?

Question 4 of 10

A pulley system of VR 5 and efficiency 60% has a mechanical advantage of

Question 5 of 10

1 eV = 1.6 × 10⁻¹⁹ J.

Question 6 of 10

Full-wave rectification makes use of

Question 7 of 10

In a d.c. motor, the commutator

Question 8 of 10

Photoelectrons are emitted only if the light's frequency is above the

Question 9 of 10

Light travels from air into glass of refractive index 1.5. Its speed in glass is

Question 10 of 10

2 kg is equal to ___ g.