| 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
|
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