Unfortunately, Mr. M. Subramanian, who maintained this website lost his battle to cancer and passed away in July, 2019. The database has over 50,000 questions. If you are interested in purchasing the website/database, please reach out using the form here.
Khub.info Learn TNPSC exam and online pratice
Q1. A skydiver with an unopened parachute is an example for
Correct answer : 1
Q2. A Skater who spins in place pulls her arm to increase the rotational speed exhibiting
Correct answer : 2
Q3. A scooter generally slips on an oily road, why?
Correct answer : 2
Q4. A satellite is moving around the earth in a circular orbit with a velocity V. If the gravitational force of the earth were to suddenly disappear, then the satellite would
Correct answer : 1
Q5. A roti maker of 1000 W power is used daily for 15 minutes. The weekly expense on using it. when the cost per unit is Rs 3 is
Correct answer : 3
Q6. A ray of light travels from water to air, if the angle of incidence is 50 degree, then the angle of refraction
Correct answer : 2
Q7. A ray of light travelling in air falls obliquely on the surface of a calm pond, it will
Correct answer : 3
Q8. A ray of light passing through the focus of the mirror; after reflection
Correct answer : 3
Q9. A ray of light of wavelength 5890 Å suffers refraction through a glass medium, if the refractive index of glass is 6/4, what is the wave length of light?
Correct answer : 2
Q10. A ray of light is incident on the pole of a concave mirror at angle of 70 degree. At what angle will it reflect?
Correct answer : 2
Q11. A ray of light is incident on a plane minor making an angle 30 degree with plane mirror. What is the angle between the incident and the reflected ray? .
Correct answer : 3
Q12. A ray of light appearing to meet the principal focus of concave lens, after refraction
Correct answer : 2
Q13. A proton has the same mass as
Correct answer : 2
Q14. A ray emerging from a point on the object, passing through the centre of curvature c, strikes the mirror normally. What is the angle of incidence?
Correct answer : 1
Q15. A proton has approximately the same mass as
Correct answer : 4
Q16. A positive charge projected towards east is deflected to wards north by a magnetic field. The magnetic field is directed
Correct answer : 4
Q17. A point of light is placed in front of a mirror:
Correct answer : 2
Q18. A point object is placed at a distance of 30 m from a convex mirror of focal length 30 cm. The image will form at
Correct answer : 4
Q19. A planet is moving around the sun in a circular orbit of circumference C. What is the work done on the planet by the gravitational force F of the sun? [W = FS cosS, S = 90; cos 90 degree = 0]
Correct answer : 3
Q20. A plane mirror reflects a beam of light to form a real image. The incident beam is
Correct answer : 3
Q21. A plane mirror produces a reversal effect, where left side of the object seems to be right. What is this property?
Correct answer : 2
Q22. A plane mirror of height 3.5 ft is used to see the entire image of a girl, the height of the girl is
Correct answer : 4
Q23. A plane mirror can form an inverted image, when the object is placed
Correct answer : 2
Q24. A plane glass slab is kept over various coloured letters. which letter does appear least raised?
Correct answer : 4
Q25. A piece of wire of resistance R is cut into three equal parts. These parts are then connected in parallel. If the equivalent of this combination is R1, then ratio R/R1 is
Correct answer : 2
Q26. A person of 160 cm height wants to see his full image in a mirror. The minimum length of the mirror he needs to see his full image is .........
Correct answer : 4
Q27. A person is suffering from both defects of vision myopia and hypermetropia. He should use
Correct answer : 4
Q28. A person has been standing on his place holding suitcase of 10 kg for 10 min. Work done is
Correct answer : 3
Q29. A person cannot see objects clearly beyond 50 cm. The power of the lens to correct the vision is ...........
Correct answer : 4
Q30. A nuclear reaction is ..............
Correct answer : 3
Q31. A net force of 10 N accelerates an object at 5 ms–2. What net force would be required to accelerate the same object at –3 ms–2? [F = ma; m = f!a = 10/5 = 2, F = 2 × 3 = 6]
Correct answer : 3
Q32. A mixture of methane. Carbon-dioxide. hydrogen and hydrogen sulphide is known as
Correct answer : 3
Q33. A merry go round of angular velocity of 12 p rod S–1 in 4 sec, then angular acceleration is
Correct answer : 2
Q34. A mass of 10 kg is moved vertically upward through a distance of 6m. What is the work done? (g = 9.8m/s2) [F = ma = 10 × 9.8; W = F × S = 98 × 6]
Correct answer : 3
Q35. A man wearing glasses of focal length +1m cannot see clearly beyond 1 m, if he is
Correct answer : 4
Q36. A man of mass of 80 kg runs up a staircase in 20 s. Another man of same mass runs up a staircase in 25 s. What is the ratio of power developed by them.
Correct answer : 1
Q37. A man pushes a wall and fails to displace it . He does
Correct answer : 3
Q38. A magnet is pushed into a coil of wire. What happens if the magnet is then pulled out at higher speed?
Correct answer : 2
Q39. A magnet cannot be demagnetised by ............
Correct answer : 4
Q40. A loud speaker converts
Correct answer : 3
Q41. A long vertical rod placed at 60 cm in front of a concave mirror gives an image at the same position, what is the focal length of the mirror?
Correct answer : 2
Q42. A long vertical pin placed at 50 cm in front of a concave mirror gives an image at the same position. What is the focal length of the mirror?
Correct answer : 3
Q43. A lens may be considered to be made up of
Correct answer : 3
Q44. A light ray travelling from a denser medium to a rarer. medium is transmitted only at
Correct answer : 1
Q45. A lamp consumes 1000J of electrical energy in 10s. What is its power?
Correct answer : 2
Q46. A hypermetropia cannot see close objects clearly, where the image is formed?
Correct answer : 4
Q47. A horizontal over head powerline carries current from east to west. The direction of the magnetic field at a point below it is directed towards
Correct answer : 4
Q48. A glass rod rubbed with silk is brought near the cap of a negatively charged gold leaf electroscope. What will be the divergence of the leaf?
Correct answer : 1
Q49. A force of 8 N acts on a body of weight 9.8 N what is the acceleration produced in rn/s2?
Correct answer : 2
Q50. A force of 5 N acts through a distance of 12 m in the direction of the force. The work done is