Maths-
General
Easy
Question
There are n straight lines in a plane, no two of which are parallel, and no three pass through the same point. Their points of intersection are joined. Then the number of fresh lines thus obtained is-
- None of these
The correct answer is:
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A father with 7 children, takes 4 at a time to the zoo, as after as he can with out taking the same four children together more than once. How after will he go? How after will each child go?
A father with 7 children, takes 4 at a time to the zoo, as after as he can with out taking the same four children together more than once. How after will he go? How after will each child go?
Maths-General
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The number of turns in primary and secondary coils of a transformer are 100 and 20 respectively. If an alternating potential of 
is applied to the primary, the induced potential in secondary will be
The number of turns in primary and secondary coils of a transformer are 100 and 20 respectively. If an alternating potential of is applied to the primary, the induced potential in secondary will be
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There are 20 questions in a question paper. If no two students solve the same combination of questions but solve equal number of questions then the maximum number of students who appeared in the examination is-
There are 20 questions in a question paper. If no two students solve the same combination of questions but solve equal number of questions then the maximum number of students who appeared in the examination is-
Maths-General
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A candidates is required to answer 6 out of 10 questions which are divided into two groups each containing 5 question and he is not permitted to attempt more than 4 from each group. The number of ways he can make up this choice is-
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Maths-General
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An e.m.f. of 
is induced in a coil when the current in another nearby coil becomes 
from zero in 
. The coefficient of mutual induction between the two coils will be
An e.m.f. of is induced in a coil when the current in another nearby coil becomes from zero in . The coefficient of mutual induction between the two coils will be
Physics-General
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The number of turns of the primary and the secondary coils of a transformer are 10 and 100 respectively. The primary voltage and the current are given as 
and 
. Assuming the efficiency of the transformer as 90%, the secondary voltage and the current respectively are
The number of turns of the primary and the secondary coils of a transformer are 10 and 100 respectively. The primary voltage and the current are given as and . Assuming the efficiency of the transformer as 90%, the secondary voltage and the current respectively are
Physics-General
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In a primary coil 
current is flowing on 220 volts. In the secondary coil 
voltage produces. Then ratio of number of turns in secondary coil and primary coil will be
In a primary coil current is flowing on 220 volts. In the secondary coil voltage produces. Then ratio of number of turns in secondary coil and primary coil will be
Physics-General
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The ratio of secondary to the primary turns in a transformer is 3:2. If the power output be 
, then the input power neglecting all losses must be equal to
The ratio of secondary to the primary turns in a transformer is 3:2. If the power output be , then the input power neglecting all losses must be equal to
Physics-General
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If a current of 
flowing in the primary coil is reduced to zero in 
, then the induced e.m.f. in the secondary coil is 
. The mutual inductance between the two coils is
If a current of flowing in the primary coil is reduced to zero in , then the induced e.m.f. in the secondary coil is . The mutual inductance between the two coils is
Physics-General
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The points on the curve 
whose ordinate and abscissa change at the same rate, are
The points on the curve whose ordinate and abscissa change at the same rate, are
Maths-General
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The real number 
when added to its inverse gives the minimum value of the sum at equals to
The real number when added to its inverse gives the minimum value of the sum at equals to
Maths-General
Maths-
The function 
increasing in
The function increasing in
Maths-General
Maths-
If 
, the minimum value of 
is
If , the minimum value of is
Maths-General
Maths-
If 
, then minimum value of 
is
If , then minimum value of is
Maths-General
Maths-
A function 
is defined by 
in
. Which of the following is not correct?
A function is defined by in. Which of the following is not correct?
Maths-General
