Class-12|NAST Pre-Board Physics Exam Paper-2079/80|Exam Copy

 

Class 12 physics 2079/2080 Pre-Board full Questions with solutitions

National Academy of Science and Technology

NAST Secondary School

Dhangadhi, kailali

Pre - board Examination -2079

Grade: XII (Science) Subject: Physics Full marks: 75 (11 marks Obj+64 marks Sub) Student  Name:.......................................

Student   Roll    No.:...................................

Student  Section:....................................

Subject Code:-1021

Candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate fu/1 marks.

Group -A: Multiple Choice Questions [11x1 =11) Time: 25 Minutes

Tick the correct answer( )

1)A person standing on a rotating platform with his arms out stretched, suddenly lowers his arms. Then his angular speed:

a) Increases

c) Remains unchanged

b) Decreases

d) Becomes zero

 Ans:Increases

2}The value of g decrease by 0.1% on a mountain as compared to sea level. To record proper time by means of simple pendulum, its length must be:

a) Increased by 0.1%

c) Increased by 0.2%

b creased by 0.1%

d) Decreased by 0.2%

 Ans:Decreased by 0.1%

3)A liquid rises to a high 'h' in a capillary tube of radius r. If the radius of capillary be 3r, the same liquid will rise to a height of:

a) h b} 1.5 h  c) 3h    d)h/3

Ans:h/3

4)A gas (y = i) at pressure P is compressed to one-eighth of it's initial volume adiabatically; then pressure will change to:

a) 32P b) BP c) 4P d)16p

Ans:16p

5)A thermodynamic system is taken through the cycle ABCD as shown in figure. Heat rejected by the gas during the cycle is :

a)4PV b)2PV c)P\f d)PV/2

Ans:PV

6}What is the phase difference between the waves represented by y= asin(wt-kx) and y= a cos(wt-kx)?

a)pi/2   b) pi c) 3pi/2 d) 2pi

Ans:pi/2

7)A wave front is a locus of :

a) Constant amplitude b) constant intensity

c)constant phase d) constant wavelength

Ans:Constant Phase

8)At neutral temperature, the thermoelectric power is :

a) Zero b)one c) Maximum d) Minimum

Ans:Zero

9)A straight Conductor carrying a current I is split into identical semicircular loops of radius 'r' as shown in figure. The magnetic induction at the centre C of the circular loop is :

a)µoi b) µoi c) µoi d) Zeto

Ans:Zero

10) For which of the following substance the susceptibility obeys curie law:

a) Diamagnetic substance b Paramagnetic substance

c) ' Ferromagnetic substance d) Superconductor

Ans:Paramagnetic Substance

11)Which of the following seismic wave is the fastest of all seismic

a)P-wave b) S-wave c) Rayleigh wave d) Love-wave

Ans:P-Wave

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