Physics-

General

Easy

Question

The graph, shown in the adjacent diagram, represents the variation of temperature $left parenthesis T right parenthesis$ of two bodies, $x$ and $y$ having same surface area, with time ( $t$ ) due to the emission of radiation. Find the correct relation between the emissivity and absorptivity power of the two bodies.

$E_{x} > E_{y} a n d a_{x} < a_{y}$
$E_{x} < E_{x} a n d a_{x} > a_{y}$
$E_{x} > E_{x} a n d a_{x} > a_{y}$
$E_{x} < E_{x} a n d a_{x} < a_{y}$

The correct answer is: $E subscript x end subscript greater than E subscript x end subscript a n d a subscript x end subscript greater than a subscript y end subscript$

Rate of cooling $left parenthesis negative fraction numerator d T over denominator d t end fraction right parenthesis proportional to$ emissivity(e)
From the graph,
$open parentheses negative fraction numerator d T over denominator d t end fraction close parentheses subscript x end subscript greater than open parentheses negative fraction numerator d T over denominator d t end fraction close parentheses subscript y end subscript$
$therefore e subscript x end subscript greater than e subscript y end subscript$
Further emissivity ( $e$ ) $proportional to$ absorptive power ( $a$ ) (good absorbers are good emitters also)
$therefore a subscript x end subscript greater than a subscript y end subscript$

$s i n space A plus s i n space 3 A plus s i n space 5 A plus s i n space 7 A equals$

maths-General

General

maths-

Value of $s i n to the power of 6 space 7 1 half to the power of ring operator plus c o s to the power of 6 space 7 1 half$ is

maths-General

General

Maths-

In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like neither tea nor coffee?

Maths-General

General

Maths-

In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like either tea or coffee?

Maths-General

General

maths-

Let $A equals left curly bracket A subscript 1 end subscript comma A subscript 2 end subscript comma A subscript 3 end subscript comma A subscript 4 end subscript comma A subscript 5 end subscript comma A subscript 6 end subscript right curly bracket$ be the set of six unit circles with centres $C subscript 1 end subscript comma C subscript 2 end subscript comma C subscript 3 end subscript horizontal ellipsis C subscript 6 end subscript$ arranged as shown in the diagram. The relation $R$ on A is defined by $left parenthesis A subscript i end subscript comma A subscript j end subscript right parenthesis element of R less than rightwards double arrow C subscript i end subscript C subscript j end subscript less or equal than 2 square root of 2$ then

maths-General

General

Maths-

In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like only coffee?

Maths-General

General

Maths-

In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like only tea?

Maths-General

General

Maths-

If n(A)=10, n(B)=20,c=5 in the given Veen diagram. Find a and b.

Maths-General

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The graph, shown in the adjacent diagram, represents the variation of temperature of two bodies, and having same surface area, with time () due to the emission of radiation. Find the correct relation between the emissivity and absorptivity power of the two bodies.

The correct answer is:

Rate of cooling emissivity(e)From the graph,Further emissivity () absorptive power () (good absorbers are good emitters also)

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In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like neither tea nor coffee?

In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like neither tea nor coffee?

In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like either tea or coffee?

In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like either tea or coffee?

Let be the set of six unit circles with centres arranged as shown in the diagram. The relation on A is defined by then

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In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like only coffee?

In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like only coffee?

In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like only tea?

In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like only tea?

If n(A)=10, n(B)=20,c=5 in the given Veen diagram. Find a and b.

If n(A)=10, n(B)=20,c=5 in the given Veen diagram. Find a and b.

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The correct answer is: $E subscript x end subscript greater than E subscript x end subscript a n d a subscript x end subscript greater than a subscript y end subscript$

Value of $s i n to the power of 6 space 7 1 half to the power of ring operator plus c o s to the power of 6 space 7 1 half$ is

Value of $s i n to the power of 6 space 7 1 half to the power of ring operator plus c o s to the power of 6 space 7 1 half$ is

What is $A union B$ for two mutually exclusive sets A and B?

What is $A union B$ for two mutually exclusive sets A and B?