| 1 |
The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
|
A. 1
B. 0.2
C. 2
D. 0.1
|
| 2 |
An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be
|
A. V/e
B. eV
C. e/V
D. V
|
| 3 |
The electrical forces between the molecules of a liquid are
|
A. Repulsive
B. Attractive
C. Both A and B
D. None
|
| 4 |
How much time, theα-particle more massive than an electron
|
A. 600
B. 7000
C. 5000
D. 15000
|
| 5 |
In a container having water filled up to a height h, a hole is made in the bottom. The velocity of water flowing out of the hole is
|
A. Independent of h
B. Proportional to h1/2
C. Proportional to h
D. Proportional to h2
|
| 6 |
Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is
|
A. 1 : 2
B. 2 : 3
C. 3 : 4
D. 8 : 9
|
| 7 |
First law of thermodynamic is special case of
|
A. Law of conservation of energy
B. Charle's law
C. Law of conservation of mass
D. Boyle's law
|
| 8 |
A line which represents the direction of travel of a wave is known as
|
A. Spherical wavefront
B. Locus
C. Ray
D. Either B or C
|
| 9 |
When two protons are brought closer potential energy of both of them:
|
A. Increases
B. Decreases
C. Remains same
D. None of these
|
| 10 |
Pair production take place when energy ofγ-rays photon is
|
A. equal to 1.02 Mev-
B. greater than 1.02 Mev
C. less than 1.02 Mev
D. none of these
|
| 11 |
Maric Curie and Pieree Curie discovered two new radioactive elements, which are called
|
A. polonium uranium
B. uranium and radium
C. polonium and radium
D. none of these
|
| 12 |
The mass of fluid passing through any cross-section per unit time is called
|
A. electric flux
B. magnetic flux
C. mass flux
D. none of them
|
| 13 |
The thermistors are usually made of
|
A. Metals with low temperature coefficient of resistivity
B. Metals with high temperature coefficient of resistivity
C. Metal oxides with high temperature coefficient of resistivity
D. Semi conducting materials having low temperature coefficient of resistivity
|
| 14 |
Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be
|
A. R/2
B. P
C. 2P
D. Depending on the relative mass of the gases
|
| 15 |
An atom in which there is a resultant magnetic field, behaves like a tiny magnet and is called as
|
A. magnetic
B. magnetic dipole
C. magnetic monopole
D. none of them
|
| 16 |
The Phenomenon of generation of induced emf is called
|
A. Electrostatic induction
B. Magnetic induction
C. Electromagnetic induction
D. Electric induction
|
| 17 |
In process of annihilation of matter, the two photons produced move in opposite direction to converse
|
A. momentum
B. charge
C. energy
D. mass
|
| 18 |
The induced current in the loop can be increased by:
|
A. Using a strong magnetic field
B. Moving the loop faster
C. Replacing the loop by a coil of many turns
D. All of above
|
| 19 |
Huygen's principle states that
|
A. Light travels in straight line
B. Light has dual nature
C. Either of these
D. None of these
|
| 20 |
The phenomenon of generation of induced emf is called:
|
A. Electrostatic induced
B. Magnetic induced
C. Electromagnetic induced
D. Electric induced
|
| 21 |
The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is
|
A. 70%
B. 100%
C. 35%
D. 38%
|
| 22 |
The linear momentum of the body is defined as
|
A. p=ma
B. p=1/2ma
C. p=mv
D. p=1/2mv
|
| 23 |
Lens's law deals with the
|
A. Magnitude of induced current
B. Magnitude of induced e.m.f
C. Direction of induced e.m.f
D. Direction of induced current
|
| 24 |
Alternating current can induce voltage because it has a
|
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
|
| 25 |
The length of rotating vector (on a certain scale) represents the:
|
A. Peak value of alternating quantity
B. RMS value of alternating quantity
C. Instantaneous value of alternating quantity
D. Either (B) or (C)
|
| 26 |
If the formula PV = nRT, n denotes:
|
A. Number of molecules per unit volume
B. Number of moles
C. Number of molecules
D. None of these
|
| 27 |
The domains are of macroscopic size of the order of
|
A. centimeters
B. meters
C. millimeters
D. nanomneters
|
| 28 |
The quantity F x t is called as
|
A. momentum
B. velocity
C. acceleration
D. impulse
|
| 29 |
A stone is dropped from rest from the top of a tower 19.6 m high. The distance traveled during the last second of its fall is (giving g=9.8 m/ss)
|
A. 9.8 m
B. 14.7 m
C. 4.9 m
D. 19.6 m
|
| 30 |
A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is
|
A. 8 J
B. 16 J
C. 4 x 10-3J
D. 2 x 10-3J
|