Hello friend as you want the Question papers of Polytechnic entrance exam so here I am providing you the same…..

8. Which is correct for inside charged sphere:
(1) E ≠ 0, V = 0 (2) E=0, V= 0 (3) E≠0, V≠0 (4) E=0, V = 0
9. The magnetic force experienced charge q in magnetic field moving with velocity V, will maximum when the angle between V and B is :
(1) 00 (2) 450 (3) 900 (4) 1800

10. A parallel plate condenser is charged with a battery. After changing of the
condenser battery is removed and two plates are separated from each other
with the help of insulating handles, than :
(1) capacitance decreases
(2) capacitance increases
(3) charge on plates increases
(4) voltage between plates increase

12. In closed organ pipe the produced harmonics are :
(1) no harmonics is produced
(2) even and odd both
(3) odd only
(4) even only

14. Light velocity in vacuum depends upon :
(1) wavelength (2) frequency (3) intensity (4) none of these

15. In a coil the current changes from 2A to 4A, 0.05 sec. and the induced enf is 8
volt, the coefficient of self induction will be :
(1) 8H (2) 0.02 H (3) 0.2 H (4) 0.8 H

16. The resistance of a galvanometer is 100 Ω Ω and maximum current which can pass through it 0.001 A. The value of shunt to change this galvanometer into voltmeter of 12 volt range will be :
(1) 12,100 Ω (2) 11,900 Ω (3) 1190 Ω (4) 11,990 Ω

17. The AC voltage is given by the equation E = E0 sin ωω ω t, if an inductance is connected in the circuit the RMS value of voltage in the circuit will be:
(1) Erms = E0
2
(2) Erms = E0
√2
(3) Erms = E0
(4) Erms = √2 E0

18. In wattles current phase difference between current and voltage is :
(1) π/4 (2) π/2 (3) π (4) zero

19. The ionization potential of hydrogen is 13.6 eV. The total energy of an electron
in its third orbit will be :
(1) 3.4 eV (2) – 3.4 eV (3) 1.5 eV (4) – 1.5 eV

20. In radioactive dis-integration the element shift by one place further after the emission of the particle :
(1) α-particle (2) β-particle (3) γ-particle (4) α,β and γ all

21. A metal surface emitted electrons of 3 eV, when a light of 4 eV are made to incident on the same metal surface the energy of the emitted photons will be :
(1) 3 eV (2) 4 eV (3) 5 eV (4) 2 eV

22. If for an electron me = 10-31 kg., velocity is 105 m/s., h = 10-34, the uncertainty
in the position of electron will be of the order of :
(1) 10-4 m (2)10-8 m (3) 10-6 m (4) 10-8 m

23. Forbidden energy gap in Ge is :
(1) 0.75 eV (2) 2.5 eV (3) 1.1 eV (4) 5 eV

24. A rod of length L and mass M is suspended from its one end and execute oscillations the time period of vibrations will be :


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