Physics-
General
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Question

A ball is released from the top of a tower. The ratio of work done by force of gravity in first, second and third second of the motion of the ball is

  1. 1 colon 2 colon 3
  2. 1 colon 4 colon 9
  3. 1 colon 3 colon 5
  4. 1 colon 5 colon 3

The correct answer is: 1 colon 3 colon 5


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    A letter lock consists of three rings each marked with 5 different letters. Number of maximum attempts to open the lock is

    A letter lock consists of three rings each marked with 5 different letters. Number of maximum attempts to open the lock is

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    Before equilibrium is set-up for the chemical reaction,blank N subscript 2 end subscript O subscript 4 end subscript rightwards harpoon over leftwards harpoon 2 N O subscript 2 end subscript, vapour density d of the gaseous mixture was measured. If D is the theoretical value of vapour density, variation of x with D/d by the graph which is the value of D/d at point A

    Before equilibrium is set-up for the chemical reaction,blank N subscript 2 end subscript O subscript 4 end subscript rightwards harpoon over leftwards harpoon 2 N O subscript 2 end subscript, vapour density d of the gaseous mixture was measured. If D is the theoretical value of vapour density, variation of x with D/d by the graph which is the value of D/d at point A

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    In the Dissociation of P C l subscript 5 end subscript commax varies with text end text fraction numerator D over denominator d end fraction according to

    In the Dissociation of P C l subscript 5 end subscript commax varies with text end text fraction numerator D over denominator d end fraction according to

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    A one kilowatt motor is used to pump water from a well 10 m deep. The quantity of water pumped out per second is nearly

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    Eight different letters of an alphabet are given. Words of four letters from these are formed. The number of such words with at least one letter repeated is

    Total number of 4 letter words formed from 8 different letters =8 cross times 8 cross times 8 cross times 8 equals 8 to the power of 4
    number of 4 letter words formed from 8 different letters with no repetition allowed =blank to the power of 8 P subscript 4
    So, the number of 4 letter words formed from 8 different letters with at least one letter being repeated =8 to the power of 4 minus blank to the power of 8 P subscript r

    Eight different letters of an alphabet are given. Words of four letters from these are formed. The number of such words with at least one letter repeated is

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    Total number of 4 letter words formed from 8 different letters =8 cross times 8 cross times 8 cross times 8 equals 8 to the power of 4
    number of 4 letter words formed from 8 different letters with no repetition allowed =blank to the power of 8 P subscript 4
    So, the number of 4 letter words formed from 8 different letters with at least one letter being repeated =8 to the power of 4 minus blank to the power of 8 P subscript r
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    The number of 4 letter words that can be formed using the letters of the word EXPLAIN which begin with a vowel when repetitions are allowed is

    In the word EXPLAIN, no. of vowels=3 no. of consonants =4
    As the 4 letter word has to start with a vowel,
    So, the number of ways of choosing the first letter =blank cubed C subscript 1=3
    Now for the next three letters we know that any letter from the 7 letters can be used as repetition is allowed.
    Therefore, the number of 4 letter words that can be formed using the letters of the word EXPLAIN which begin with a vowel when repetitions are allowed =3 cross times 7 cross times 7 cross times 7 =1029

    The number of 4 letter words that can be formed using the letters of the word EXPLAIN which begin with a vowel when repetitions are allowed is

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    In the word EXPLAIN, no. of vowels=3 no. of consonants =4
    As the 4 letter word has to start with a vowel,
    So, the number of ways of choosing the first letter =blank cubed C subscript 1=3
    Now for the next three letters we know that any letter from the 7 letters can be used as repetition is allowed.
    Therefore, the number of 4 letter words that can be formed using the letters of the word EXPLAIN which begin with a vowel when repetitions are allowed =3 cross times 7 cross times 7 cross times 7 =1029
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    Which of the following statements is wrong?

    Which of the following statements is wrong?

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    The number of 3 digited numbers that can be formed using {1,2,3,4,5} any number of times is

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    The number of 3 digited numbers that can be formed using {1,2,3,4,5} any number of times is

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    The number of 3 digited numbers that can be formed using {1,2,3,4,5} any number of times = 5 cross times 5 cross times 5=125
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rightwards double arrow fraction numerator 12 factorial over denominator open parentheses 12 minus r close parentheses factorial end fraction equals 11 factorial open square brackets fraction numerator 1 over denominator 5 factorial end fraction plus 6 fraction numerator 1 over denominator 6 factorial end fraction close square brackets
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rightwards double arrow fraction numerator 12 over denominator open parentheses 12 minus r close parentheses factorial end fraction equals fraction numerator 2 over denominator 5 factorial end fraction
rightwards double arrow fraction numerator 6 over denominator open parentheses 12 minus r close parentheses factorial end fraction equals fraction numerator 1 over denominator 5 factorial end fraction
rightwards double arrow 6 cross times 5 factorial equals open parentheses 12 minus r close parentheses factorial
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rightwards double arrow r equals 6

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rightwards double arrow fraction numerator 12 factorial over denominator open parentheses 12 minus r close parentheses factorial end fraction equals 11 factorial open square brackets fraction numerator 1 over denominator 5 factorial end fraction plus 6 fraction numerator 1 over denominator 6 factorial end fraction close square brackets
rightwards double arrow fraction numerator 12 cross times 11 factorial over denominator open parentheses 12 minus r close parentheses factorial end fraction equals 11 factorial open square brackets fraction numerator 1 over denominator 5 factorial end fraction plus fraction numerator 6 over denominator 5 factorial cross times 6 end fraction close square brackets
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rightwards double arrow 6 factorial equals open parentheses 12 minus r close parentheses factorial
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rightwards double arrow fraction numerator open parentheses n minus 5 close parentheses factorial over denominator open parentheses n minus 7 close parentheses factorial end fraction equals 42
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    Write the missing product in the following reaction–4 H N O subscript 3 plus P subscript 4 O subscript 10 rightwards arrow 4 H P O subscript 3

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    In phosphorus estimation, the compound Mg NH4PO4 is converted on ignition to–

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rightwards double arrow open parentheses 7 minus r close parentheses factorial equals open parentheses 8 minus r close parentheses factorial
rightwards double arrow open parentheses 7 minus 7 close parentheses factorial equals open parentheses 8 minus 7 close parentheses factorial space space space space space open square brackets 0 factorial equals 1 space a n d space 1 factorial equals 1 close square brackets
rightwards double arrow r equals 7

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    G i v e n space to the power of 8 P subscript r equals blank to the power of 8 P subscript open parentheses r plus 1 close parentheses end subscript
rightwards double arrow fraction numerator 8 factorial over denominator open parentheses 8 minus r close parentheses factorial end fraction equals fraction numerator 8 factorial over denominator open parentheses 8 minus r minus 1 close parentheses factorial end fraction
rightwards double arrow fraction numerator 1 over denominator open parentheses 8 minus r close parentheses factorial end fraction equals fraction numerator 1 over denominator open parentheses 7 minus r close parentheses factorial end fraction
rightwards double arrow open parentheses 7 minus r close parentheses factorial equals open parentheses 8 minus r close parentheses factorial
rightwards double arrow open parentheses 7 minus 7 close parentheses factorial equals open parentheses 8 minus 7 close parentheses factorial space space space space space open square brackets 0 factorial equals 1 space a n d space 1 factorial equals 1 close square brackets
rightwards double arrow r equals 7
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