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2nd December 2014, 11:49 AM
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| Re: Question Papers for JEST
Here I am providing you previous year question papers of JEST for your preparation of exam. Q 1. If a person has a meter scale and he has to measure a length of 50 m. Each time he measures the measurement lies from 99.8 to 100.2 cm. Estimate the net error, when takes measurement 50 times? (a) 0.2 cm (b) 0.4 cm (c) 0.82 cm (d) 10 cm. Q 2. If coherent source of light through A,B has wavelength λ such AB = 4λ . If the detector is moving along the loop of radius R such that R>> AB then if the radius is increased gradually what effect will it have on the no. of maxima detected by detector D? (a) increase (b) decrease (c) first increase than decrease (d) none Q 3. Slit separation = d Slit width = w A plane wavefront incident, when will the 3rd maxima will be missing (a) 3d = 2w (b) 2d = 3w (c) d = 2w Q 4. If 2P −1 = Prime no. (a) P is a odd no. (b) P can composite no. (c) P is necessarily composite no. (d) P is Prime no. Q 5. Find the velocity of box (a) v cosθ (b) v sinθ (c) v tanθ Q 6. A heard ball dropped from a 1 m height and rebounces to 95 cm. Calculate the total distance travelled by ball? (a) 1880 cm (b) 2160 cm Q 7. If an astronaut knows the maximum and min distance between the moon of a planet and the planet maximum orbital velocity of moon is know which quantity of the following can’t be calculated. A B A, B are known (a) mass of planet (b) mass of moon (c) Time of the orbit (d) semi major axis. Q 8. If P and q are two distinct prime numbers then how many divisors p2q3 have? Q 9. represent carnot cycle in T – S diagram Q 10. If proton and α − particle accelerated by same potential v, find the ratio of debroglie wavelength ? (a) 2 2:1 (b) 2:1 (c) 1 : 2 (d) none of these Q 11. Two events are taking place at a distance 5 km with a time interval 5μ s. In an inertial frame. An observer observes two events as simultaneous. Determine the speed of observer. Q 12. Find the time taken for blue light λ = 400nm, to cover a distance of 80 km in optical fiber having refractive .Index = 1.6 Ans. 427 μ sec. Q 13. A small mass m moving with velocity collides with turnable table get attached after collision and moves with angular velocity w? find w? Q 14. A proton accelerated by a potential difference of 1000 V and enter into magnetic field B = 1000 T along a circular path of r = 20 cm. Determine the velocity of proton during circular motion. (a) 1 m/s (b) 105m/s (c) 100 m/s (d) none Q 15. A mass m is attached to a spring with one end to a rigid support and to other end a spring is connected which is attached to a mass m. having same spring constant calculate the node frequency. Q 17. If donors are added to n-type semiconductor then (i) Electrons increases holes remain constant (ii) Electrons increases holes decreases (iii) Electrons increases holes increases (iv) No effect will takes place. Q 18. A particle X of mass M at rest decays into a particle A of mass mA and another particle of zero mass. Determine the energy of A. Q 19. A charge q drops from rest from height d to infinite grounded conducting plates. Calculate the time to reach the charge to plates. Detailed Previous Year Question Papers for JEST:      |