MCQ
Find out correct option which describe the Red shift of distant galaxies.
- AExpansion of the universe
- BThe Uncertainty Principle
- CBlack holes
- DSuperconductivity
✓
Answer
- Expansion of the universe
Explanation:
Red shift is the increase in wavelength of light observed due to Doppler Effect of light, observed when objects recede from each other.
The red shift as observed in distant galaxies suggests that the galaxies are moving away from us and from each other. This tells that the universe is expanding.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be
|
(a) 2900 Å |
(b) 2500 Å |
(c) 5380 Å |
(d) 2000 Å |
Which logic gate is represented by the following combination of logic gates
|
(a) OR |
(b) NAND |
(c) AND |
(d) NOR |
The energy of electron in the nth orbit of hydrogen atom is expressed as 
. The shortest and longest wavelength of Lyman series will be
| (a) 910 Å, 1213 Å | (b) 5463 Å, 7858 Å | (c) 1315 Å, 1530 Å | (d) None of these |
The valence of an impurity added to germanium crystal in order to convert it into a P-type semi conductor is
|
(a) 6 |
(b) 5 |
(c) 4 |
(d) 3 |
Equipotential surfaces associated with an electric field which is increasing in magnitude along the x-direction are
|
(a) Planes parallel to yz-plane |
|
(b) Planes parallel to xy-plane |
|
(c) Planes parallel to xz-plane |
|
(d) Coaxial cylinders of increasing radii around the x-axis |
In a coil of area 
and 10 turns with a magnetic field directed perpendicular to the plane and is changing at the rate of 
gauss/second. The resistance of the coil is 20 ohm. The current in the coil will be
|
(a) 5 amp |
(b) 0.5 amp |
(c) 0.05 amp |
(d) 5 |
Which color band in the resistor is having highest tolerance?
Consider a moving charged particle in a region of magnetic field. Which of the following statements are correct?
- If v is parallel to B, then path of particle is spiral.
- If v is perpendicular to B, then path of particle is a circle.
- If v has a component along B, then path of particle is helical.
- If v is along B, then path of particle is a circle.
Assertion : We can measure the potential barrier of a PN junction by putting a sensitive voltmeter across its terminals.
Reason : The current through the PN junction is not same in forward and reversed bias.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If assertion is false but reason is true. |
How many quantities are required to specify the magnetic field of the earth?