7th Grade > Mathematics
RATIONAL NUMBERS MCQs
Total Questions : 120
| Page 6 of 12 pages
:
Answer: 1 Mark
Reason: 1 Mark
A rational number is one which has an integer as itsnumerator and denominator but the denominator cannot be equal to zero. Hence, the rational numbers here are:39,−411
As the numbers√2,π cannot be written in simple fractions therefore thay are irrational ( Note: π=227 is a popular approximation, but it is not accurate.)
Answer: Option B. -> -1
:
B
Letpqbe a non-zero rational number.Thenp,q≠0.
Its additive inverse is−pq.
That is,pq+−pq=−pq+pq=0
On dividingpqby−pq,we get-1.
:
B
Letpqbe a non-zero rational number.Thenp,q≠0.
Its additive inverse is−pq.
That is,pq+−pq=−pq+pq=0
On dividingpqby−pq,we get-1.
Answer: Option B. -> 3/2
:
B
:
B
Answer: Option B. -> 18
:
B
Converting all the lengths into centimetre.
Total length of the rope = 4050 cm,
Length of each piece
=94×100=9004
Number of Pieces
=TotallengthLengthofeachpiece
Number Of Pieces Cut
=4050(9×100)4=18
=4050×4(9×100)=18
Number of pieces cut = 18.
:
B
Converting all the lengths into centimetre.
Total length of the rope = 4050 cm,
Length of each piece
=94×100=9004
Number of Pieces
=TotallengthLengthofeachpiece
Number Of Pieces Cut
=4050(9×100)4=18
=4050×4(9×100)=18
Number of pieces cut = 18.
Answer: Option B. -> 812
:
B
Consider 23.
To make the numerator 8, we have to multiply the numeratorby 4.
Therefore, multiplying bothnumerator and denominator by 4 gives the required number.
2×43×4=812
Therefore, required rational number is812.
:
B
Consider 23.
To make the numerator 8, we have to multiply the numeratorby 4.
Therefore, multiplying bothnumerator and denominator by 4 gives the required number.
2×43×4=812
Therefore, required rational number is812.
:
4422=21 [Dividing both numerator and denominator by 22]
21=2
Answer: Option B. -> −14
:
B
Let the number be x.
14−x=12
x=14−12=−14
:
B
Let the number be x.
14−x=12
x=14−12=−14
Answer: Option D. -> 1716
:
D
Let the number to be added be x.
−34+x=516
x=516+34=516+1216=1716.
:
D
Let the number to be added be x.
−34+x=516
x=516+34=516+1216=1716.
Answer: Option D. -> 0
:
D
A number which can be written in the form pq , where p and q are integers and q ≠ 0 is called a rational number.
By the above definition, pq can be a rational number only when q≠ 0.
So, for the given fraction to be not a rational number, x should be zero.
For all the other givenvalues of x, we will obtain a rational number.
For example, when x = 1,
−11x=−111=−11
when x = 2,
−11x=−112=−5.5
when x = -1,
−11x=−11−1=11
:
D
A number which can be written in the form pq , where p and q are integers and q ≠ 0 is called a rational number.
By the above definition, pq can be a rational number only when q≠ 0.
So, for the given fraction to be not a rational number, x should be zero.
For all the other givenvalues of x, we will obtain a rational number.
For example, when x = 1,
−11x=−111=−11
when x = 2,
−11x=−112=−5.5
when x = -1,
−11x=−11−1=11
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