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5th December 2014, 10:27 AM
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Join Date: Apr 2013
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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