#1
5th December 2014, 08:05 AM
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TRB Polytechnic Question Paper
I want to get TRB Polytechnic physics entrance question paper, will you please provide me that ?
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#2
5th December 2014, 10:27 AM
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Re: TRB Polytechnic Question Paper
As you want to get RB Polytechnic physics entrance question paper, so here I am giving you some questions of that: In wattles current phase difference between current and voltage is : (1) π/4 (2) π/2 (3) π (4) zero 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 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 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 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 Forbidden energy gap in Ge is : (1) 0.75 eV (2) 2.5 eV (3) 1.1 eV (4) 5 eV The energy of monatomic gas is : (1) only rotational (2) only vibrational (3) only translatory (4) all the above The work done in increasing the size of a bubble by 10-2 m2 (T = 25 dyne 1 cm.) : (1) 0.4 x 10-4 erg (2) 50 x 102 erg (3) 25 x 102 erg (4) 25 x 10-2 erg A geostationary satellite is at a distance of 8 Re revolving around the earth and another satellite is revolving round the earth at 3.5 Re distance, its revolution period will be: (1) 8.5 hrs. 92) 16.5 hrs. (3) 18 hrs. (4) 12 hrs. The work done per unit extension in length of a wire will be (L = length, A = area of cross section) : (1) YL2 (2) YA (3) YA (4) YL 2A 2L2 2L 2A The total energy of a body at distance r from the earth will be : (1) - Gmem (2) – Gmem (3) Gmem (4) Gmem r 2r 2r r A boy is revolving on a dice with spreading hands. Suddenly the boy brings his near his body, the change in the system will be : (1) angular velocity increases (2) angular velocity decreases (3) angular velocity unchanged (4) angular momentum decreases A body moving with 50 m/sec. Velocity collides elastically with another body at rest. After the collision the velocity of first body changes to 30 m/sec., the velocity of the second body will be: (1) 30 m/sec. (2) 60 m/sec. (3) 80 m/sec. (4) 50 m/sec. The radius of a circular aperture is variable. The light of λλ λ wavelength is made to incident on the aperture a screen is placed at distance b from the aperture. When one increases the radius of the aperture, the value of the radius of aperture for which second time dark point will be obtained on the screen will be : (1) √bλ (2) √3bλ (3) √4bλ (4) √2nbλ The length of a sonometer wire is ττ τ and tension T and frequency is n. If the length and tension on sonometer wire are doubled the frequency will become : (1) 2n (2) n (3) √2n (4) n 2 √2 Two forks of approximately equal frequencies are used to produce Lissajou figures. If the Lissajous figure changes its shape once in 1 sec. If the frequency of one of the tuning fork is 1000 Hz, the frequency of second fork will be : (1) 1000 Hz (2) 1002 Hz (3) 2000 Hz (4) 1001 Hz Fundamental frequency of an open pipe is : (1) 15 Hz (2) 20 Hz (3) 30 Hz 94) 10 Hz The workdone in expanding a gas from 10 m3 to 20 m3 at one atmospheric pressure will be : (1) 106 J (2) 103 J (3) 102 J (4) 105 J The mean kinetic energy of the molecule at a given temp. will be max. for : (1) Hydgrogen (2) Oxygen (3) Helium (4) Equal for all Kind of bonding in H2 is : (1) covalent (2) vander waals (3) ionic (4) metallic The density of iron is 7 x 103 k/m3 and breaking stress is 7.9 x 108 N/m2, the max, length of the wire which will unable to break the wire from its own weight will be: (1) 105 M (2) 103 M (3) 104 M (4) 102 M A cylinder rools down the inclined plane of length 0.15 m. If the mass of cylinder is 0.1 kg. The velocity at the bottom of the inclined plane will be: (1) 3.5 m/sec. (2) 2 m/sec. (3) 1.4 m/sec. (4) 2.4 m/sec. A stopper is attached in the middle of glass tube. Two bubbles of radius 2 cm. and 4 cm. are formed at the end of the glass tube. If one opens the stopper : (1) small bubble will reduce and large will increase (2) both will increase (3) both will reduce (4) small will increase and large will reduce A 500 µ µF capacitor is charged with a battery of 100 volt and it is discharged through 10 Ω Ω resistance the heat produced in resistance will be: (1) 1.25 J (2) 5 J (3) 10 J (4) 2.5 J Two condensers of 1 µ µF are connected in series with a battery of 6 volt, the total charge on condensers will be : (1) 2 µC (2) 2.5 µC (3) 9 µC (4) 4 µC Transformer changes : (1) DC current (2) DC voltage (3) AC voltage (4) AC & DC voltage Lenzis law is based upon : (1) law of conservation of energy (2) law of conservation of angular momentum (3) law of conservation of momentum (4) law of conservation of charge |
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