JEE Advanced · Physics
Mechanics, heat and electricity
30 practice questions, each with the answer and an explanation.
Practise Mechanics, heat and electricity now
Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.
All 30 questions
- What force gives a mass of 7 kg an acceleration of 7 m/s²?
- How much gravitational potential energy does a 10 kg mass gain when lifted 2 m? (take g = 10 m/s²)
- A machine does 1200 J of work in 60 s. What is its power?
- A force of 600 N acts on an area of 0.2 m². What pressure does it exert?
- A wave has a frequency of 500 Hz and a wavelength of 4 m. What is its speed?
- A wire 2 m long carries 5 A at right angles to a magnetic field of 0.5 T. What force acts on it?
- A transformer has 100 turns on the primary coil and 1000 turns on the secondary. The primary voltage is 230 V. What is the secondary voltage?
- A gas in a rigid container is at 200 kPa and 250 K. Its temperature is changed to 375 K. What is the new pressure?
- An object is placed 40 cm from a convex lens of focal length 10 cm. How far from the lens is the image?
- A body moves in a circle of radius 50 m at 20 m/s. What is its centripetal acceleration?
- A body moving at 10 m/s accelerates uniformly at 2 m/s² for 9 s. What is its final speed?
- What force gives a mass of 18 kg an acceleration of 2 m/s²?
- What is the kinetic energy of a 5 kg body moving at 7 m/s?
- How much gravitational potential energy does a 5 kg mass gain when lifted 14 m? (take g = 10 m/s²)
- A force of 100 N acts at 60° to the horizontal and moves a body 7 m along the horizontal. How much work does it do?
- A machine does 4500 J of work in 20 s. What is its power?
- A machine takes in 500 J of energy and gives out 100 J of useful work. What is its efficiency?
- What is the pressure due to a column of liquid of density 800 kg/m³ and depth 20 m? (take g = 10 m/s²)
- A spring of constant 500 N/m is stretched by 0.2 m. How much energy is stored in it?
- A resistor of 5 Ω carries a current of 3 A. What is the potential difference across it?
- How much energy in kWh does a 3000 W heater use in 4 hours?
- A 2 μF capacitor is charged to 12 V. How much charge does it store?
- A transformer has 1000 turns on the primary coil and 10000 turns on the secondary. The primary voltage is 230 V. What is the secondary voltage?
- How much heat is needed to warm 2 kg of water by 10 °C? (specific heat capacity of water = 4200 J/(kg °C))
- A gas in a rigid container is at 300 kPa and 400 K. Its temperature is changed to 800 K. What is the new pressure?
- An object is placed 20 cm from a convex lens of focal length 15 cm. How far from the lens is the image?
- A radioactive sample of 640 g has a half-life of 10 days. How much remains after 40 days?
- A body moves in a circle of radius 50 m at 30 m/s. What is its centripetal acceleration?
- A stone is dropped from a height of 80 m. How long does it take to reach the ground? (take g = 10 m/s²)
- A body of volume 0.01 m³ is fully immersed in a liquid of density 1000 kg/m³. What is the upthrust? (take g = 10 m/s²)