Why doesn’t the north star appear to move like the other stars?
The pole star,is situated in the direction of the earth’s axis so it does not appear to move.
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Define light year.
Light year is the distance travelled by light in one year. Speed of light is = 3×108 m/s Time = 365... View Article
How many moons does Mars have?
By numbers of moons of a planet we mean that how many natural satellites does it have. Mars has two... View Article
Considering a hypothetical situation where Ram, while going to mars promises Shyam to return after completion of one year. Shyam was on earth and was waiting for Ram to return, but after 365 days he didn’t come. He came after 687 days from mars. Why?
Since Mars is a greater distance from Sun than earth, therefore it has a bigger orbit and takes 678 days... View Article
Average power is defined as?
Answer: Average power is defined as the ratio of total work done by the body to the total time taken... View Article
Two very thin metallicwires placed along X and Y-axis carry equal currents as shown here. AB and CD are lines at 450 with the axes with origin of axes at O. The magnetic field will be zero on the line [MP PMT
Every point on line AB will be equidistant from X and Y-axis. So magnetic field at every point on line... View Article
A body of mass is placed on the earth’s surface. It is taken from the earth’s surface to a height h=3rR. The change in gravitational potential energy of the body is
Subtract the gravitational potential energy at initial state from GPE at at final state.
There are two bodies of masses 100 and 10000 separated by a distance 1. At what distance from the smaller body, the intensity of gravitational field will be zero
From the above figure, we can say that the point O is at a distance of Xm from 100kg. The... View Article
Which of the following planet is nearest to the Sun? Does it have any moon?
Mercury is the nearest planet to Sun, and it has no moons i.e. it does not have any natural satellite.
Consider the situation shown in the figure. The wire AB is sliding on the fixed rails with aconstant velocity. If the wire AB is replaced by semicircular wire, the magnitude of the induced current will [MP PMT 1999]
Effective length between A and B remains same.
Statement 1: Moon is a natural satellite of earth. Statement 2: Man made satellites launched from earth to orbit around it, are known as artificicial satellites, but moon is a naturally occuring celestial body,which revolves around the earth.
Since, moon is a naturally occurring celestial body, which revolves around the earth, and thus it is a natural satellite... View Article
Any celestial body revolving around another celestial body is known as its
Any celestial body revolving around other celestial body is known as is satellite. For example, Moon revolves around earth in... View Article
A thin slice is cut out of a glass cylinder along aplane parallel to its axis. The slice is placed on a flat glass plate as shown. The observed interference fringes from this combination shall be
The cylindrical surface touches the glass plate along a line parallel to axis of cylinder. The thickness of wedge shaped... View Article
Abeam of light AO is incident on a glass slab in a direction as shown in figure. The reflected ray OB is passed through a Nicol prism on viewing through a Nicole prism, we find on rotating the prism that[CPMT 1986]
In the arrangement shown, the unpolarised light is incident at polarising angle of 90° – 33° = 57°. The reflected... View Article
Statement 1: Besides revolving around the Sun, a planet rotates on its own axis.Statement 2: All planets revolve around the sun and rotate on their own axis.
All planets revolve around the sun and rotate on their own axis. The phenomenon of day and night occurs because... View Article
Earth takes 365 days to revolve around the Sun whereas, Mars takes 687 days to complete one revolution around the sun. Why do Mars take more time than earth to complete its revolution around the Sun?
Since, Mars is at a greater distance than earth from the Sun. Therefore, Mars takes more time to complete a... View Article
An electric potential difference will be induced betweenthe ends of the conductor shown in the diagram, when the conductor moves in the direction
Conductor cuts the flux only when, if it moves in the direction of M.
Statement 1: Planets revolving around the sun never collide. Statement 2: Planets revolve around the sun in a definite path known as orbit.
Which is the correct statement and explain why? All planets revolve around the sun in a definite path, known as... View Article
Comment on the statements. Statement 1: Stars twinkle but planets do not. Statement 2: Stars have their own light but a planet does not.
Statement 1: Stars twinkle, but planets do not. Our sun is the nearest star. Stars are farther away from us than planets, the... View Article
Which star is the source of light and heat for all the planets including earth in our solar system?
Answer: Sun is a star and is known to be a source of light and heat for all the planets... View Article
