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Friday, 18 December 2015

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AAI ATC previous sampled questions from physics subject

 For solutions and more questions @@ http://www.eqans.com/questions/

1. When a metal is heated it emits predominantly
a. electrons
b. protons
c. positrons
d. neutrons

2. Thermonic emission was discovered by
a. Thomas Edison
b. lee de forest
c. fleming
d. Rutherford

3. work function is generally expressed in
a. electron volt
b. joule
c. newton
d. gauss

4. the saturation current in a diode can be increased by
a. lower plate potential
b. raising plate potential
c. increasing cathode temperature
d. decreasing cathode temperature

5.The saturation current in diode valve depends upon
a. plate voltage
b. temperature of the filament
c. neither a nor b
d. both a and b
6. in a halfwave rectifier the rms valve of the a.c component of the wave is
a. greater than d.c value
b. less than d.c value
c. equal to d.c value
d. zero

7. when a charged particle moves in a transverse magnetic field, it path of motion is
a. parabolic
b. circular
c. elliptical
d. linear

8. an electron moves with a constant velocity V parallel to the direction of uniform magnetic field B. the force experienced by the electron is
a. BeV
b. eV/B
c. B/eV
d. zero

9. An electron of mass M kg and charge ‘e’ columbs travel from rest through a potential difference of V volts. The field energy of electron in joule is
a. MeV
b. eV/M
c. eV
d. e/V

10. A charged particle moves through a magnetic field perpendicular to it. The energy of the particle
a. increases
b. decreases
c. remains unchanged
d. first increase and then decreases

11. an electric or magnetic field cannot accelerate
a. electrons
b. protons
c. neutrons
d. alpha particles

12.  mass spectrograph determines
a. spectrum of light
b. charge of the ion
c. specific charge of the positive rays
d. specific charge of the cathode rays

13. the dimensional representation of plancks constant is same as that of
a. momentum
b. torque
c. gravitational constant
d. angular momentum

14. the potential energy associated with an electron in the orbit
a. increases with increase in radii of orbit
b. decreases with increase in radii of orbit
c. remains unchanged with the change in radii of the orbit
d. none of these
15. what is the SI unit of Young modulus of elasticity
a. dyne/cm
b. newton/m
c. newton/m2
d. m2/s

16. one astronomical unit is the average distance between
a. earth and sun
b. earth and the moon
c. Jupiter and the sun
d. Pluto and the sun

17. the most suitable unit for expressing nuclear radius is
a. micron
b. nanometer
c. Fermi
d. angstrom

18. which of the following is a vector quantity
a. momentum
b. pressure
c. energy
d. work


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