List of practice Questions

What is the molecular mass of \( \text{K}_2\text{SO}_4 \)?
Which of the following gases has the highest density at STP?
What is the pH of a solution of \( 0.01 \, \text{M} \, \text{HCl} \)?

Why does Charley say, “He (Sam) certainly can’t go back to his old business”? (The Third Level)

Two point charges \(+2 \, \mu\text{C}\) and \(-2 \, \mu\text{C}\) are placed 0.1 m apart in air. What is the electrostatic force between them?
A body of mass 10 kg is moving with a speed of 5 m/s. What is the momentum of the body?
What is the focal length of a lens if its power is +2 D?
A stone is dropped from a height of 45 m. What is the time taken for the stone to reach the ground?
A current of 2 A flows through a resistor for 10 minutes. What is the total charge that flows through the resistor?
A ray of light strikes a plane mirror at an angle of incidence \(30^\circ\). What is the angle between the incident ray and the reflected ray?
A capacitor is charged with a voltage of 100 V. If the capacitance of the capacitor is \( 10 \, \mu\text{F} \), what is the charge on the capacitor?
The potential energy of a body at a height of 10 meters is 200 J. What is its mass? (Take \( g = 10 \, \text{m/s}^2 \))
A body of mass 10 kg is moving with a speed of 5 m/s. What is the momentum of the body?
A convex lens has a focal length of 10 cm. What is the magnification produced when the object is placed 30 cm from the lens?
A block of mass \(2\, \text{kg}\) is placed on a smooth horizontal surface. A force of \(10\, \text{N}\) is applied horizontally on the block. What is the acceleration of the block?
A ball is dropped from a height of 20 m. What is its velocity just before hitting the ground? (Take \( g = 9.8 \, \text{m/s}^2 \))
What is the focal length of a lens if its power is \( +2 \, \text{D} \)?
A body of mass 2 kg is moving with a velocity of 3 m/s. What is its kinetic energy?
A bulb rated 60 W operates for 2 hours. How much energy does it consume in this time?
The potential energy of a body at a height of 10 meters is 200 J. What is its mass? (Take \( g = 10 \, \text{m/s}^2 \))
The energy of a photon is \(6.6 \times 10^{-19} \, \text{J}\). What is the frequency of the photon?
(Take Planck’s constant \(h = 6.6 \times 10^{-34} \, \text{Js}\))
A stone is dropped from a height of 45 m. What is the time taken for the stone to reach the ground?
A current of 2 A flows through a resistor for 10 minutes. What is the total charge that flows through the resistor?
A convex lens has a focal length of 10 cm. What is the magnification produced when the object is placed 30 cm from the lens?
A car is moving along a straight road with a constant velocity of 20 m/s. The driver applies the brakes, and the car decelerates at a constant rate of \(4 \, \text{m/s}^2\). How much time will it take for the car to come to rest?