| 1 |
During the free fall motion of an object, when its weight becomes equal to the drag force, then it will move with
|
A. maximum speed
B. zero speed
C. maximum speed
D. none of them
|
| 2 |
The critical temperature of mercury is
|
A. 1.18 K
B. 4.2 K
C. 3.72 K
D. 7.2 K
|
| 3 |
The number of field lines passing through unit
area held perpendicular to the field lines represent:
|
B. Intensity of the field
|
| 4 |
The range of wavelengths of colurs in the visible colours is
|
A. 140 nm to 456 nm
B. 10 nm to 56 nm
C. 410 nm to 656 nm
D. 910 nm to 956 nm
|
| 5 |
The rate of decay of a radioactive substance
|
A. decrease exponentially with time
B. decreases linearly with time
C. increases linearly with time
D. increases exponentially with time
|
| 6 |
The most common source of alternating voltage is:
|
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
|
| 7 |
The magnetic field inside a solenoid can be increased by:
|
A. Increasing n
B. Decreasing I
C. Increasing I
D. By using iron core within solenoid
|
| 8 |
Which of the following options states the names of fluids in the order of increasing viscosity?
|
A. mercury, motor oil, methanol
B. methanol, mercury, motor oil
C. motor oil, mercury, methanol
D. methanol, motor oil, mercury
|
| 9 |
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
|
| 10 |
Least distance of distinct vision of an old man possibly becomes:
|
A. A little less than 25 cm
B. A little more than 25 cm
C. Much less than 25 cm
D. None of these
|
| 11 |
Energy gas behaves like an ideal gast at
|
A. High temperature and low pressure
B. Low temperature and high pressure
C. Both A and B
D. None
|
| 12 |
An electric charge at rest is
|
A. Only an electric field
B. Only a magnetic field
C. Both electric and magnetic fields
D. None of the above
|
| 13 |
When sound waves travel from air to water which of these remains constant?
|
A. Velocity
B. Frequency
C. Wavelength
D. All the above
|
| 14 |
A choke coil is used as a resistance in
|
A. d.c. circuit
B. a.c. circuit
C. d.c. potentiometer circuit
D. wheatstone bridge
|
| 15 |
The average value of current and voltage over a cycle is
|
A. Positive
B. Negative
C. Zero
D. May be positive or negative
|
| 16 |
The open loop gain of OP-AMP is of the order of
|
A. 102
B. 103
C. 104
D. 105
|
| 17 |
In case of mechanical waves, we study the motion of
|
A. a single particle
B. collection of particle
C. any one of them
D. none of them
|
| 18 |
One radian is:
|
A. Greater than one degree
B. Less than one degree
C. Equal to one degree
D. None of them
|
| 19 |
The reactance of a cell changes directly with
|
A. frequency of a.c
B. the inductance
C. both a and b
D. none of these
|
| 20 |
The terminal velocity of a small size spherical body of radius R moving in a fluid varies as
|
A. R
B. R2
C. 1/R
D. (1/R)2
|
| 21 |
The value of current gain of n-p-n transistor is of the order of
|
A. tens
B. hundreds
C. thousands
D. ten thousands
|
| 22 |
The law of conservation of energy gives us
|
A. equation of continuity
B. Bernoulli's theorem
C. both of them
D. none of them
|
| 23 |
A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy
|
A. 200 J
B. 100 J
C. 1000 J
D. 400 J
|
| 24 |
Such an inductor coil which does not consume energy and is often employed for controlling a.c. without consumption of energy is called
|
A. Choke
B. impedance
C. Semi-conductor
D. None
|
| 25 |
The body oscillates due to ______ accelerates and overshoots the rest position due to _____:
|
A. Applied force , inertia
B. Restoring force, friction
C. Frictional force, inertia
D. Restoring force, inertia
|
| 26 |
The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately
|
A. 9.8
B. 24 x 1019
C. 24 x 1042
D. 24 x 10-44
|
| 27 |
A train of 150 m length is going towards north direction at a speed of 10 ms-1. A parrot files at a speed of 5 ms-1towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to
|
A. 12 s
B. 8 s
C. 15 s
D. 10 s
|
| 28 |
A force of 5 n is acting Y-axis. Its component along X-axis is:
|
A. 7 N
B. 5 N
C. Zero
D. 10 N
|
| 29 |
The magnitude of the force producing an acceleration of 10 m/sec2in a body of mass 500 grams is:
|
A. 3 N
B. 4 N
C. 5 N
D. 6 N
|
| 30 |
Inertia mass and gravitational mass are
|
A. opposite
B. identical
C. identical when there is no friction
D. all of them
|