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maths

An unbiased coin is tossed. If the outcome is a head then a pair of unbiased dice is rolled and the sum of the numbers obtained on them is noted. If the toss of the coin results in tail then a card from a well-shuffled pack of nine cards numbered is randomly picked and the number on the card is noted. The probability that the noted number is either or is?

A .
B .
C .
D .
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physics

A radioactive nucleus (initial mass number A and atomic number Z) emits -particles and positrons. The ratio of number of neutrons to that of protons in the final nucleus will be

A .
B .
C .
D .
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physics

The given diagram shows four processes i.e., isochoric, isobaric, isothermal  and adiabatic. The correct assignment of the process, in the same order is given by :-

question
A .
d a c b
B .
a d c b
C .
a d b c
D .
d a b c
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physics

A nucleus A, with a finite de - broglie wavelength . undergoes spontaneous fission into two nuclei B and C of equal mass. B flies in the same direction as that of A, while C flies in the opposite direction with a velocity equal to half of that of B The deBroglie wavelengths and of B and C are respectively :-

A .
B .
C .
D .
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chemistry

Give a test that can be used to differentiate chemically between butter and cooking oil.

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biology

Explain how sexual reproduction gives rise to more viable variations than asexual reproduction. How does this affect the evolution of those organisms that reproduce sexually?

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history

"The first clear expression of nationalism came with the 'French Revolution' in ". Examine the statement.

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biology

Write any two limitations of ecological pyramids.

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physics

An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?

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geography

Why has the 'Chhotanagpur Plateau Region' the maximum concentration of iron and steel industries? Analyze the reasons.

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