Physics Set 23 FAQs

1. An object of weight 8000 N rests on four identical feet, each of area 0.10 m². The pressure on the ground is:

2. The sum of 12.34 g, 5.6 g and 0.789 g, to the correct precision, is:

3. In a hydraulic lift the small and large pistons have areas 10 cm² and 200 cm². A force of 50 N is applied on the small piston. The force on the large piston is:

4. The viscous drag force on a sphere of radius a moving with velocity v through a fluid of viscosity η is:

5. Which kinematic equation for constant acceleration relates final velocity, initial velocity, acceleration and displacement, without time?

6. The strength of an electromagnet can be increased by: (I) Increasing the current through the coil (II) Increasing the number of turns of the coil (III) Inserting an iron core in the coil Which of the above is/are correct?

7. In domestic circuits, the circuit with a 15 A current rating is used for:

8. The time period of a simple pendulum at a given place depends on its:

9. Most artificial satellites orbit about 800 km above the Earth. The time they take for one orbit is roughly:

10. The extra month added every few years in luni-solar calendars is called:

11. Free liquid drops and bubbles are spherical due to:

12. In an electric circuit, a fuse is placed:

13. Materials that are not attracted towards a magnet are called:

14. Which of the following devices uses a current-carrying conductor in a magnetic field?

15. A body starts from rest with a constant acceleration of 3 m s⁻². The distance covered in 4 s is:

16. On the Fahrenheit scale, the number of equal intervals between the ice point and the steam point is:

17. When an object is taken from the Earth to the Moon:

18. The collective oscillations of the constituents of a material medium manifest themselves as:

19. The Rashtriya panchang is published annually by the:

20. Consider the following statements: (I) A dimensionally correct equation is always an exact equation. (II) A dimensionally inconsistent equation must be wrong. (III) Dimensionless constants cannot be obtained by dimensional analysis. Which of the above is/are correct?

21. A convex lens has a focal length of +20 cm. An object is placed 30 cm in front of it. The image distance is:

22. The excess pressure inside a liquid drop of radius r and surface tension S is:

23. The Earth completes one revolution around the Sun in about:

24. Consider the following statements about kinetic energy: (I) It has no direction. (II) It increases when positive work done on the object increases its velocity. (III) It remains constant when negative work is done on the object. Which of the above is/are correct?

25. The world's largest stone sundial, the Samrat Yantra, is located at:

26. The size of the pupil is controlled by the:

27. Bernoulli's equation ideally applies to fluids that are:

28. Knowledge of G, g and the radius of the Earth enables an estimate of the:

29. A compass needle is, in fact, a:

30. Consider the following statements: (I) In a series circuit, if one component fails, the circuit is broken and none of the components works. (II) A parallel circuit divides the current through the electrical gadgets. (III) A series arrangement is suitable for gadgets that need widely different currents. Which of the above is/are correct?