HR Police PC · General Science
Mechanics, heat, light, sound, electricity and magnetism.
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Q1 · Physics · EASY
A train moving at 72 km/h applies brakes and comes to rest in 10 seconds. What is the retardation (deceleration) of the train?
Q2 · Physics · MEDIUM
A metal ball of mass 2 kg is dropped from a height of 20 m. Assuming no air resistance and taking g = 10 m/s², what is the kinetic energy of the ball just before it hits the ground?
Q3 · Physics · MEDIUM
A convex lens of focal length 20 cm forms an image of an object placed at a distance of 30 cm from the lens. What is the nature and position of the image?
Q4 · Physics · HARD
Two resistors of 6 ohms and 3 ohms are connected in parallel. This combination is then connected in series with a 2 ohm resistor. If a potential difference of 12 V is applied across the entire circuit, what is the total current flowing through the circuit?
Q5 · Physics · MEDIUM
A moving train has a velocity of 72 km/hr. What is its velocity in meters per second?