NCERT Class 10 Math Chapter 8 MCQ Question Answer – Introduction to Trigonometry

Class 10
Chapter  Introduction to Trigonometry
Subject Math
Category MCQ

Class 10 Math Chapter 8 MCQ Question Answer

1. The value of 9sec2A – 9tan2A is:
(A) 1
(B) 8
(C) 9
(D) 0

Answer

Ans – (C) 9

2. The value of 5sec² A-5 tan2A is:
(A) 1
(B) 2
(C) 9
(D) 5

Answer

Ans – (D) 5

3. If sin A = \displaystyle \frac{3}{4}, then cos A is :

(A) \displaystyle \frac{4}{{\sqrt{7}}}

(B) \displaystyle \frac{{\sqrt{7}}}{4}

(C) \displaystyle \frac{3}{{\sqrt{7}}}

(D) None of these

Answer

Ans – (B) \displaystyle \frac{{\sqrt{7}}}{4}

4. \displaystyle \frac{{1-tan{}^\text{2}\text{ }45{}^\circ }}{{1+tan{}^\text{2}\text{ }45{}^\circ }} is equal to :

(A) tan 90°
(B) 1
(C) sin 45°
(D) 0

Answer

Ans – (D) 0

5. \displaystyle \frac{{2tan\text{ }30{}^\circ }}{{1+tan{}^\text{2}\text{ }30{}^\circ }} is equal to :

(A) sin 60°
(B) cos 60°
(C) tan 60°
(D) sin 30°

Answer

Ans – (C) tan 60°

6. In ΔABC, right-angled at B, AB = 24 cm, BC = 7 cm. The value of sin A is:

(A) \displaystyle \frac{7}{{25}}

(B) \displaystyle \frac{7}{{24}}

(C) \displaystyle \frac{{24}}{{25}}

(D) None of these

Answer

Ans – (A) \displaystyle \frac{7}{{25}}

7. If tan A = \displaystyle \frac{5}{{12}} then the value of cos A is :

(A) \displaystyle \frac{5}{{13}}

(B) \displaystyle \frac{{12}}{5}

(C) \displaystyle \frac{{13}}{5}

(D) \displaystyle \frac{{12}}{{13}}

Answer

Ans – (D) \displaystyle \frac{{12}}{{13}}

8. The value of \displaystyle \frac{{1-ta{{n}^{\text{2}}}{{{30}}^{\circ }}}}{{1+\text{ }ta{{n}^{\text{2}}}{{{30}}^{\circ }}}} is:
(A) cos 60°
(B) tan 60°
(C) sin 60°
(D) tan 30°

Answer

Ans – (A) cos 60°

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