| 1 |
The law of conservation of energy gives us
|
A. equation of continuity
B. Bernoulli's theorem
C. both of them
D. none of them
|
| 2 |
The missing mass which is converted to energy in the formation of nucleus, is called
|
A. packing fraction
B. mass defect
C. binding energy
D. none of these
|
| 3 |
The internal energy of an ideal gas system is generally the
|
A. translational K.E of molecules
B. vibrational K.E of molecules
C. rotational K.E of molecules
D. all of them
|
| 4 |
When a body moves along a circular path with constant speed, it has an acceleration, which is always directed
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A. Along the tangent
B. Towards the centre
C. Away from the centre
D. None of them
|
| 5 |
If water rises 4 cm in a long, thin tube because of capillary action, then, under corresponding conditions of use, the rise (in the tube) of a liquid whose density is 2 g/cm2will be
|
A. 1 cm
B. 2 cm
C. 8 cm
D. None
|
| 6 |
The efficiency of diesel engine is
|
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
|
| 7 |
When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as
|
A. impurification
B. adding
C. doping
D. extrinsivity
|
| 8 |
In describing functions of digital systems, a closed switch will be shown as
|
A. 0
B. 1
C. low
D. any one of these
|
| 9 |
In rotational motion, analogue of force F us called:
|
A. Couple
B. Torque
C. Mass
D. Moment of intertia
|
| 10 |
Free electrons are
|
A. tightly bound
B. fixed
C. loosely bound
D. tightly fixed
|
| 11 |
For addition and subtraction purposes, absolute uncertainties are:
|
A. Added
B. Subtracted
C. Multipiled
D. Divided
|
| 12 |
A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be
|
A. 1/2
B. More than 1/2
C. Less than 1/2
D. Between 1 and 2
|
| 13 |
The motion of a body in a straight line is the motion in
|
A. one dimension
B. two dimension
C. three dimension
D. four dimension
|
| 14 |
Computer chips are made from:
|
A. Iron
B. Silicon
C. Helium
D. Stontium
|
| 15 |
Magnetic induction is also called as:
|
|
| 16 |
The force experienced by an electron projected in a magnetic field B with a velocity V is given by
|
A. F=e(V x B)
B. F= -e(V x B)
C. F= e(B x V)
D. Both a and c
|
| 17 |
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
|
| 18 |
A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when
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A. The coil is distorted
B. The coil is rotated
C. The coil is neither distorted nor rotated
D. Both A and B
|
| 19 |
The passage of current is accompanied by a
magnetic field in the surrounding space:
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| 20 |
Motional emf is called motional:
|
A. Electromagnetic force and is measured in newtons
B. Electromotive force and is measured in volt
C. Electromotive force and is measured in newtons
D. Electromagnetic force and is measured in volts
|
| 21 |
Alternating current is produced by a voltage source which polarity:
|
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
|
| 22 |
If force and displacement are in opposite direction, the work done is taken as:
|
A. Positive work
B. Negative work
C. Zero work
D. Infinite work
|
| 23 |
The ratio of the size of the image to that of object is called:
|
A. Focal length
B. Aperture
C. Linear magnification
D. Principal axis
|
| 24 |
A galvanometer is an instrument used to
|
A. measure voltage across a circuit
B. detect current in a circuit
C. measure current flowing through a circuit
D. none of these
|
| 25 |
The body will move with terminal velocity when it acquires
|
A. minimum speed
B. zero speed
C. maximum speed
D. none of them
|
| 26 |
The bonding between the semi-conductor materials is
|
A. covalent
B. ionic
C. either of them
D. none of them
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| 27 |
The work done on the body will be zero if:
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A. No force is applied on the body
B. Force is applied but no displacement
C. Angle between F(force) and d(displacement) is 90°
D. All of these are correct
|
| 28 |
The A.M. transmission frequency range from
|
A. 500-1000 KHz
B. 540-1600 KHz
C. 300-490 KHz
D. 900-2040 KHz
|
| 29 |
The device which can
convert heat energy into electrical energy is called:
|
|
| 30 |
The closed loop gain of the inverting amplifier is written as
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A. G = R2/R1
B. G = 1 + R2/R1
C. G = -R2/R1
D. G = 1 - R2/R1
|