1) The value of the variable that we get on solving an equation is
a) Degree of an equation
b) Root of an equation
c) Co-efficient of the variable
d) None of these
2)If both sides of an equation are divided by the same (non-zero) quantity, the equality
a) does not change
b) changes
c) may or may not change
d) none of these
3) The ratio of 3 kg and 1kg 500g in the simplest form is
a) 1:5 b) 5:1 c) 2:1 d) 1:2
4) In a class there are 15 girls and 25 boys, percentage of boys in the class is
a) 37.5% b) 62.5% c) 800/3 % d) 160%
5) The value of 3m2+2m-7 at m= -2 is
a) 1 b) -1 c) 9 d) 23
6) Adding x + 1, x – 1 and –x-1, we get
a) 3x b) 2x c) x-1 d) 1-x
7) 20,00,000 in standard form is
a) 0.2X105 b) 2.0X106 c) 10.2X106 d) 10.2X105
8) If (3/4)x ÷ (3/4)2 = (3/4)5 , then x is
a) 7 b) 3 c) 5/2 d) -3
9) The perimeter of the adjoining figure is
7cm
a) 58cm b) 36cm c) 25cm d) 14cm
7cm
10) The area of the shaded region is:
a) 12 sq.cm b) 24 sq.cm c) 36 sq.cm d) 18 sq.cm
Answers
1) The value of the variable that we get on solving an equation is
a) Degree of an equation
b) Root of an equation
c) Co-efficient of the variable
d) None of these
Answer :- b) Root of an equation .
2) If both sides of an equation are divided by the same (non-zero) quantity, the equality
a) does not change
b) changes
c) may or may not change
d) none of these
Answer :- a) does not change .
3) The ratio of 3 kg and 1kg 500g in the simplest form is
a) 1:5 b) 5:1 c) 2:1 d) 1:2
Answer :-
→ 3kg : 1kg + 500 gm
→ 3 * 1000 : 1 * 1000 + 500
→ 3000 : 1000 + 500
→ 3000 : 1500
→ 2 : 1 (c)
Answer (4) :-
→ Total girls = 15
→ Total boys = 25
So,
→ Total students = 15 + 25 = 40
then,
→ % of boy = (Total boys * 100) / Total students = (25 * 100)/40 = 62.5% (b)
5) The value of 3m² + 2m-7 at m= -2 is
a) 1 b) -1 c) 9 d) 23
Solution :-
→ f(m) = 3m² + 2m - 7
→ f(-2) = 3(-2)² + 2 * (-2) - 7
→ f(-2) = 3 * 4 - 4 - 7
→ f(-2) = 12 - 11
→ f(-2) = 1 (a)
6) Adding x + 1, x – 1 and – x - 1, we get
a) 3x b) 2x c) x-1 d) 1-x
Answer :-
→ (x + 1) + (x - 1) + (- x - 1)
→ x + x - x + 1 - 1 - 1
→ (x - 1) (c)
7) 20,00,000 in standard form is
a) 0.2X105 b) 2.0X106 c) 10.2X106 d) 10.2X105
Answer :-
→ 2000000 = 2 * 10⁶ = 2.0 * 10⁶ (b)
8) If (3/4)x ÷ (3/4)2 = (3/4)5 , then x is
a) 7 b) 3 c) 5/2 d) -3
Answer :-
→ (3/4)^x ÷ (3/4)² = (3/4)⁵
using a^m ÷ a^n = a^(m - n) ,
→ (3/4)^(x - 2) = (3/4)⁵
using a^m = a^n => m = n
→ (x - 2) = 5
→ x = 7 (a)
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Answer:
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