| 1 |
X-rays eject electrons from matter by
|
A. Pair production
B. Pair annihilation
C. Compton effect
D. Photoelectric effect
|
| 2 |
The total energy of the hydrogen atom is
|
A. zero
B. Infinite
C. positive
D. Negative
|
| 3 |
Which gas strictly obeys gas laws.
|
A. Hydrogen gas
B. Inert gas
C. Ideal perfect gas
D. Helium gas
|
| 4 |
In fission reaction, heavy water is used as a
|
A. Coolant
B. Moderator
C. Heat exchanger
D. Controller of reaction rate
|
| 5 |
Which of the following is not essential for the free oscillations of a mass attached to a spring.
|
A. Elasticity
B. Gravity
C. Inertia
D. Restoring force
|
| 6 |
Radio carbon in the atmosphere is produced by the bombardment of.
|
A. Oxygen by high energy neutrons
B. Oxygen by high energy protons
C. Nitrogen by high energy protons
D. Nitrogen by high energy neutrons
|
| 7 |
If Young's experiment is performed in water. which of the following change will occur.
|
A. Fringe width will increases
B. Fringe width will decreases
C. Fringe width will remain unchanged
D. No fringe will be seen
|
| 8 |
Which material has the greatest di electric constant.
|
A. Mylar
B. Glass
C. Germanium
D. Water
|
| 9 |
In case of a convex lens when object is placed away from 2F, image is formed.
|
A. at F
B. at 2F
C. away from 2 F
D. Between F and 2 F
|
| 10 |
If the transformer turns ratio is 2 and the impedance eof primary coil is 250 Ohms then the impedance secondary coil will be.
|
A. 125 Ohms
B. 250 Ohms
C. 500 Ohms
D. 1000 Ohms
|
| 11 |
A charge less region which separates p-type and n-type semiconductors in a p-n junction is known as.
|
A. Polar region
B. Null region
C. Depletion region
D. Neutral region
|
| 12 |
Tuning fork is a source of.
|
A. Heat
B. Energy
C. Light
D. Sound
|
| 13 |
The net charge on a condenser is
|
A. Zero
B. Q/2
C. 2Q
D. Infinity
|
| 14 |
If each particle of the fluid passing through a point follows the same path then flow is said to be
|
A. Regular flow
B. Irregualr flow
C. Turbulent flow
D. Streamline flow
|
| 15 |
A fringe is a path of.
|
A. Constant amplitude
B. Constant phase
C. Same wavelength
D. Constant frequency
|
| 16 |
If two bodes are under a collision that is not perfectly elastic then.
|
A. K.E. is conserved but momentum is not
B. Momentum is conserved but K.E. is not
C. Neither K.E. nor momentum is conserved
D. Both K.E. and momentum are conserved
|
| 17 |
Which of the following propagates at the same speed as velocity of light.
|
A. Heat waves
B. Sound waves
C. Shock waves
|
| 18 |
A solid in which there is no regular arrangement of molecules.
|
A. Amorphous solids
B. Glassy solids
C. Crystalline solids
D. Polymerization
|
| 19 |
When two waves travelling through the same medium arrive at the same point 180 o out of phase, they give rise to.
|
A. Polarization
B. Destructive interference
C. Refraction
D. Constructive interference
|
| 20 |
Angular momentum of a body under a central force is
|
A. Zero
B. Maximum
C. Minimum
D. Constant
|
| 21 |
An operational amplifier have how many input terminals.
|
A. One
B. Two
C. Three
D. Four
|
| 22 |
The ration Cv/Cp = y for a diatomic gas like air is
|
A. 1.29
B. 1.30
C. 1.40
D. 1.67
|
| 23 |
A car is travelling on a level highway at at speed of 15 m s-1. A braking force of 3,000 N brings the car to stop in 10 s The mass of the car is.
|
A. 1500 kg
B. 2,000 kg
C. 2,500 kg
D. 3,000 kg
|
| 24 |
A transistor consists of.
|
A. One p-n junction
B. Two p-n junctions
C. Three p-n junctions
D. Four p-n junction
|
| 25 |
When a pentavalent material like arsenic is added to a tetravalent material such as germanium, we get a.
|
A. n-type material
B. p -type material
C. diode
D. super conductor
|
| 26 |
Interference effects of light were verified by
|
A. Thomas Young
B. Newton
C. Bragg
D. Huygen
|
| 27 |
Vectors are ofhen spilt into two or more orthogonal components what is true of these components.
|
A. they are perpendicular
B. They are parallel
C. They are antiparallel
D. They have same magnitude
|
| 28 |
If the specific latent heat of vaporization of oxygen is 214 kJ kg-1 how much heat will be absorbed when 3.0 kg of oxygen is boiled off at its boiling point.
|
A. 14 kJ
B. 64 k J
C. 140 kJ
D. 642 k j
|
| 29 |
Who discovered a relation between electric and magnetic field.
|
A. Hans Christian Oersted
B. Michelson Faraday
C. Lenz
D. Hertz
|
| 30 |
The cause of production of eddy current is the
|
A. Current flowing in a conductor
B. Current flowing in a insulator
C. Motion of a conductor in a varying magnetic field
D. Motion of an insulator in a varying magnetic field
|