| 1 |
When a platinum wire is heated, it appears white at |
1600<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
900<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
1100<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
1300<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
|
| 2 |
When platinum wire is heated, it appears cherry red at |
1600<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
900<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
1100<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
1300<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
|
| 3 |
When a platinum wire is heated, it appears yellow at |
1600°C
900°C
1100°C
1300°C
|
| 4 |
When a platinum wire is heated, it appears orange red at |
500<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
900<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
1100<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
1300<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
|
| 5 |
When a platinum wire is heated, it appears dull red at about |
500°C
900°C
1100°C
1300°C
|
| 6 |
A high temperature, the proportion of shorter wavelengths radiation, emitted by the body |
decreases
first increases then decreases
increases
any one of them
|
| 7 |
At the temperature, a body emits radiation which is principally |
of long wavelengths in the visible region
of long wavelengths in the invisible infrared region
of short wavelength in invisible ultraviolet region
none of these
|
| 8 |
According to the special theory of relativity, a moving clock |
runs faster
runs slower
neither runs faster nor slower
all of these
|
| 9 |
Newton's law of motion do not hold in |
an accelerated frame of reference
an unaccelerated frame of reference
both of these
none of these
|
| 10 |
The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of |
2 cm/s
20 cm/s
200 cm/s
2000 cm/s
|
| 11 |
According to the special theory of relativity |
mass and energy are same entities
mass and energy are same entities but interconverible
mass and energy are different entities but interconverible
mass and energy are different entities but non-interconveritble
|
| 12 |
The mass of an object will be doubled at speed |
1.6 x 10<sup>8</sup>ms<sup>-1</sup>
2.6 X 10<sup>8</sup>ms<sup>-1</sup>
2.6 x 10<sup>7</sup>ms<sup>-1</sup>
2.6 x 10<sup>9</sup>ms<sup>-1</sup>
|
| 13 |
The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes |
2 mo
1.67 mo
0.67 mo
2.67 mo
|
| 14 |
The Einstein's changes in length, mass and time are not observed in common life because |
We dont observer then seriously
The masses are too large
Their speed is too small than the speed of right
All of the above
|
| 15 |
If a body reaches a speed equal to the speed of light, then its mass will became |
zero
very small
infinity
none of these
|
| 16 |
If a material object moves with the speed of light 'C' its mass becomes |
Equal to its rest mass
Four times of its rest mass
Double of its rest mass
Infinite
|
| 17 |
Which one of the following physical quantities changes with relativistic speed |
Length
Mass
Time
All of the above
|
| 18 |
According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body |
Remains constant
Decreases
Increases to infinity
Reduced to zero
|
| 19 |
A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is |
1.66 m
1.0 m
0.66 m
2.66 m
|
| 20 |
If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers |
larger
shorter
equal
none of these
|
| 21 |
According to Einstein, with the great increase in the speed of the body the relativistic length of the body |
Remains constant
Decreases
Increases
Reduces to zero
|
| 22 |
The length contraction happens only |
Opposite to the direction of motion
along the direction of motion
perpendicular to the direction of motion
In any direction
|
| 23 |
The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum |
2.9 s
3.0 s
6.6 s
9.6 s
|
| 24 |
According to the special theory of relativity, time is |
absolute quantity
not absolute quantity
constant quantity
none of these
|
| 25 |
The special theory of relativity is based on the |
one postulate
two postulates
three postulates
four postulates
|
| 26 |
The general theory of relativity treats problems involving |
inertial frame of references
accelerating frame of references
both of these
none of these
|
| 27 |
The special theory of relativity treats problems invoving |
inertial frame of references
accelerating frame of references
both of these
none of these
|
| 28 |
A non-inertial frame of reference is one, in which |
law of inertial is valid
all laws of physics are the same in all frames
a>0 or a<0
a=0
|
| 29 |
An inertial frame is that frame in which |
a>0
a=0
a<0
none of these
|
| 30 |
Which of the following is not an example of intertial frame |
a body placed on the surface of earth
a body placed in a car moving with uniform velocity
a body placed in a car moving with same acceleration
none of these
|
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