PHYSICS NUST

NUST NET QUESTION

PHYSICS 

1. 0's on right side of non- zero numbers are?

A . Significant

 B . non-significant 

C . sometimes significant and sometimes 

D . none of these 

2. What is the magnification when the image of an object through convex lens is formed at its Focal length?

A . 1 

B . 1.5 

C . 2 

D . 2.5 

3. Maxima in young's experiment indicate?

 A . bright bands 

B . constructive interference 

C . dark bands 

D . Both a and b 

 4. how much heat a 100 watt bulb will generate in 1 hour?

A . 0 joule 

B . 60 joule 

C . 3600 joule 

D . 360000 joule

 5. If y-component of a force acting in y direction is 6N the x-component will be 

A . 6N 

B . 12N 

C . zero 

D . none of these 

 6. Time seen from ground in clock of airplane?

 A . seems slower 

B . seems faster 

C . constant 

D . unpredictable

7. Resistance of RCL series circuit at resonance is? 

A . Xc

B . R 

C . Xl 

D . Xl x R x Xc

8. Power of RCL circuit at resonance is?

A . zero

 B . minimum 

C . maximum 

D . none of these

9. an emf of 10 v is observed in one coil when the current is changing at the rate of 5 As^-1 in the other coil. What is the mutual inductance of the coil?

A . 50H 

B . 40H 

C . 5H 

D . 2H

 10. an electron is placed between two charged plates the upper plate is positively charged and the lower plate is negative charged. The electron will

A . deflect downwards 

B . deflect upwards 

C . go straight 

D . none of these 

11. A spring clock is wound by a key. Which of following is true

A . neither elastic potential energy nor kinetic energy exists 

B . both elastic potential energy and kinetic energy exist 

C . kinetic energy exists whereas there's no elastic potential energy 

D . elastic potential energy exists whereas there's no kinetic energy 

12. Rate of change of momentum is

A . torque 

B . force 

C . time 

D . none of these

13. If V=100 is applied to RLC series circuit. If 200 watt power is dissipated by passing 4A current. Then in the capacitor 

A . Current leads by 90 

B . Current lags by 90 

C . Voltage lags by 60 

D . Voltage leads by 60

14. For V=Vosint find period

A . pie 

B . 2pie 

C . pie/2 

D . zero 

15. In interference energy ___ destroyed

A . May be 

B . will be 

C . can be 

D . cannot be 

 16. Speed of sound is greatest in

 A . glass 

B . water 

C . wood 

D . plastic

17. Speed of sound is greatest in 

A . plastic 

B . wood 

C . water 
D . copper 

 18. wave fronts coming from small light bulb

A . spherical 

B . cylindrical 

C . plane 

D . none of these 

 19. moving charge produces a

A . magnetic field 

B . electric field 

C . both a and b 

D . none of these 

 20. if the grating element is made 1/10th the resolving power will become

A . 1/100 times 

B . 1/10 times 

C . 100 times 

D . 10 times 

21. if 60 capacitors are connected in series and then in parallel what is the ratio of Cs/Cp=? 

A . 250 

B . 3600 

C . 1/60 

D . 1/3600 

22. source of light is

A . sun 

B . moon 

C . glass 

D . none of these 

 23. When wood is replaced by air as dielectric. The capacitance of capacitor 

A . decreases 

B . increases 

C . remains constant 

D . none of these 

24. at resonance RLC circuit has impedance

 A . inductive 

B . capacitive 

C . R/LC 
D . resistive 

25. Which of the following is not an example of periodic motion

 A . a man walking in street

 B . rolling ball 

C . a moving fan

D . vibratory motor

 26. energy of alpha and beta particles has the relation:

A . alpha > beta 

B . alpha < beta 

C . alpha=beta 

D . depends on source

27. Newton first law is applicable on 

I)body in motion II)body in rest 

A . I only 

B . II only 

C . neither a nor b 

D . both a and b 

 28. Two conducting objects, x and y having charge q on them exert force F on each other. now third conductor having charge - q is touched with x and removed, the new force between x and y is 

A . F 

B . F/2 

C . 2F 

D . zero 

29. which has the highest internal resistance 

A . refrigerator

B . 100 watt bulb 

C . tube light 

D . ceiling fan 

30. entropy is the measure of ________ of a system 

A . heat 

B . kinetic energy 

C . momentum 

D . disorder 

 31. scattering of photon by electron is called 

A . photoelectric effect 

B . pair production 

C . annihilation 

D . compton effect 

32. when the source moves towards an observer then its frequency 

A . increase 

B . decrease 

C . remain constant 

D . none of these 

 33. which of the following can’t be used as a dielectric in a capacitor 

A . wax 

B . iron 

C . air 

D . all of these 

34. in a pure resistive circuit current and voltage are 

A . in phase 

B . out of phase 

C . current leads 

D . voltage leads

35. the constant between I and V is 

A . R 

B . 1/R 

C . 2R 

D . none of these 

 36. when a body moves with the speed of light then its mass approaches to 

A . zero 

B . infinity 

C . remains same 

D . none of these 

37. Efficiency of the Carnot's cycle will be 100% if the absolute temp is 

A . +273K 

B . -273K 

C . 100K 

D . 0K 

 38. what happens to bulk of potential energy of a glass that falls from a table and breaks A . converted into kinetic energy 

B . wasted in air 

C . converted into sound 

D . consumed in breaking of glass 

39. the earth magnetic field deflects high velocity positive charge towards 

A . north 

B . south 

C . west 

D . east 

40. In Einstein's theory, the deflection of light is predicted to be exactly ____ ____ as great as it is according to Newton's theory 

A . Four times 

B . Thrice 

C . One and a half time 

D . Twice 

41. In hot day white clothes are worn because they are good 

A . absorbers 

B . emitters 

C . reflectors 

D . none of these 

42. Forces in nature always occur in 

A . triplet 

B . quadrupled 

C . isolation 

D . pair 

 43. In F= GMm/R the dimensions of G is? 

A . [M-1L+2T-2] 

B . [M-1L+3T-2] 

C . [M-1L+2T-3] 

D . none of these 

44. Mass of body is 10kg . What will be its weight if body moves 500*10^6 m away from the surface of earth? 

A . 9.8 

B . 0.98 

C . 0.098 

D . equivalent to zero 

 45. blue colored source is seen Red if 

A . source is moving away from observer 

B . observer is moving away from source 

C . gamma rays effect is observed 

D . none of these 

46. a ballistic missile is 

A . unpowered 

B . unguided 

C . both a and b 

D . none of these 

 47. Debroglie wavelength for an electron and proton are Le and Lp respectively. And frequencies are Fe and Fp then correct one is 

A . Fe < Fp , Le > Lp 

B . Le < Lp , Fp < Fe 

C . Le < Lp , Fe = Fp 

D . Le > Lp , Fe > Fp 

 48. light rays coming from the tube light are 

A . plane 

B . spherical 

C . cylindrical 

D . none of these 

49. when some charge is given to a soap bubble it 

A . increases in size 

B . decreases in size 

C . remain same 

D . collapses

50. Which one has the more resistance 500 watt or 40 watt? 

A . 40 watt 

B . 500 watt 

C . both have equal 

D . depends on teh volatge source