| 1 |
The work done by the system on its environment is considered as
|
A. positive
B. negative
C. zero
D. any one of them
|
| 2 |
The error may occur due to:
|
A. Negligence
B. Faulty apparatus
C. Inappropriate method
D. all of these
|
| 3 |
A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then
|
A. The charge in the plates reduces and potential difference increase
B. Potential difference between the plates increase, stored energy decreases and charge remains the same
C. Potential difference between the plates decreases and charge remains unchanged
D. None of the above
|
| 4 |
The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
|
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
|
| 5 |
Unit of impulse in
|
A. Newton
B. Kg m
C. Kg m/s
D. Joule
|
| 6 |
The force exerted on a conductor of length L, carrying current I when placed in a magnetic field B is given by
|
A. F=IB/L
B. F= L x B/I
C. F = IL x B
D. F = IL . B
|
| 7 |
In bringing an electron towards another electron, electrostatic potential energy of system
|
A. Decreases
B. Increases
C. Remains uncharged
D. Becomes zero
|
| 8 |
The modulus of elasticity can be written as
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A. stress x strain
B. strain/stress
C. 1/2 x stress x strain
D. stress/strain
|
| 9 |
The temperature scale approved in SI units is:
|
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these
|
| 10 |
If the values of instantaneous and average velocities are equal, the body is said to be moving with
|
A. uniform acceleration
B. uniform speed
C. variable velocity
D. uniform velocity
|
| 11 |
A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
|
A. decreases
B. first increases then decreases
C. increases
D. any one of them
|
| 12 |
Neon gas have three isotopes whose atomic numbers are
|
A. 20, 24 , 23
B. 20, 21 , 22
C. 20, 19 , 21
D. none of these
|
| 13 |
Kirchhoff's first rule is also called:
|
A. Loop rule
B. Thumb rule
C. Point rule
D. Right hand rule
|
| 14 |
The use of chips in electrons is described in the form of:
|
A. Yellow boxes
B. Black boxes
C. Red boxes
D. White boxes
|
| 15 |
In the above figures, tell which set is graphs shows that a body is moving uniform velocity:
|
A. (i) and (ii)
B. (ii) and (iii)
C. (i) and (iii)
D. (ii) and (iv)
|
| 16 |
At the present time, the main frontiers of fundamental science are
|
A. 2
B. 3
C. 4
D. 5
|
| 17 |
When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
|
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
|
| 18 |
The maximum possible error in the reading for a meter rod with least count 1 mm is:
|
A. 0.005 mm
B. 0.05mm
C. 0.5mm
D. 5.0mm
|
| 19 |
For the working of a heat engine, there must be
|
A. a source of heat at high temperature
B. a sink at low temperature
C. both of them
D. none of them
|
| 20 |
Particles have the mass smallest of following is:
|
A. Electron
B. Proton
C. Neutron
D. Quark
|
| 21 |
If the length of the conductor is double and its cross sectional area is halved, its conductance will
|
A. Increase four fold
B. Become one-fourth
C. Become one-half
D. Remains unchanged
|
| 22 |
Electron volt is the unit of.
|
A. Potential difference
B. Energy
C. Resistance
D. Capacitance
|
| 23 |
Which of these is not a radiation detector
|
A. Wilson cloud chamber
B. cyclotron acceleration
C. Geiger Miller counter
D. solid state detector
|
| 24 |
What is frequency of radio waves transmitted by a station, if the wavelength of those waves is 300 m?
|
A. 1 MHz
B. 10 Hz
C. 1 GHz
D. 100000 Hz
|
| 25 |
A 60 W bulb operates on 220 V supply. The current flowing through the bulb is
|
A. 11/3 A
B. 3 A
C. 3/11 A
D. 6
|
| 26 |
The rear wheels of an automobile are rotating with an angular velocity of 14 rev/sec which is reduced to 38 rad/sec in 5 second when brakes are applied. Its angular acceleration is:
|
A. 5 rad/sec2
B. -10 rev/sec2
C. -10 rad/sec2
D. -5 rev/sec2
|
| 27 |
The pressure will be low where the speed of the fluid is
|
A. Zero
B. High
C. Low
D. Constant
|
| 28 |
In the doping process, the ratio of the doping atoms to the semi conductor atom is
|
A. 1 to 10
B. 1 to 103
C. 1 to 106
D. 1 to 109
|
| 29 |
The SI unit of viscosity is
|
A. kg m-1s-1
B. kg ms-1
C. kg m-1s-2
D. kg m-1s
|
| 30 |
With the increase of temperature viscosity
|
A. Increase
B. Decrease
C. Remains same
D. Doubles
|