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16. The heat required to convert 2 kg of water at 20°C in a calorimeter to steam at 100°C and at atmospheric pressure (1 atm) is ______ kJ. (Specific heat […]

15. Whales can dive undersea to depths of 2 km. The pressure on the whale at this depth (ignoring atmospheric pressure) is ______ × 10⁶ Pa. (Density of sea water […]

14. A massless ideal spring is hanging vertically. A sphere of mass 500 g, suspended from the spring, stretches the spring from its initial position by 50 cm when it […]

13. Rain is falling vertically with a speed of 40 m s⁻¹. Wind starts blowing with a speed of 16 m s⁻¹ in the west to east direction. How should […]

12. The potential difference to accelerate an electron was quadrupled. By what factor does the de Broglie wavelength of the electron beam change Effect of Quadrupling the Accelerating Potential on […]

11. What is the acceleration due to gravity (m/s²) on the surface of a planet if its radius is 1/4ᵗʰ that of Earth and its mass is 1/80ᵗʰ that of […]

10. A man throws a ball vertically up in the air with an initial velocity V1 such that it reaches a height of 12 m with a speed of 12 […]

9. Calculate the temperature (in K) at which the resistance of a metal becomes 20% more than its resistance at 300 K. The value of the temperature coefficient of resistance […]

8. An object is placed at the principal focus of a concave lens of focal length 10 cm. The image will be formed at ____ cm, between the optical center […]

7. The velocity of blood in a blood vessel of 2.0 cm radius is 30 cm/s. When the blood vessel bifurcates into 2 smaller vessels of radius 1.0 cm each, […]