Chapter no. 08 trigonometry

Chapter no. 08   trigonometry

Q: 1   Choose the correct answer

1.        The value of cos60°=                      .

a-) 1/√2                                                                                                b-) 1/2

c-) √3/2                                                                                                                d-) 1

2.       The value of sin60°=                                        .

a-) 1/2                                                                                                   b-) 1

c-) √3/2                                                                                                d-) 1/√2

3.       The value tan60°=                                            .

a-) 1/√3                                                                                                b-) 1

c-) 1                                                                                                       d-) 1/√2

4.       1+cot² θ =                                            .

a-) tan²θ                                                                                              b-) √3

c-) cosec²θ                                                                                          d-) cos²θ

5.       Cos²θ + sin²θ=                                    .

a-) tan²θ                                                                                              b-) sec²θ

c-) cosec²θ                                                                                          d-) cos²θ

6.       √1+tan²θ =                                          .

a-) sin θ                                                                                                b-) cos θ

c-) sec θ                                                                                               d-) cosec θ

7.       If Base =3, Perpendicular = 4 the hypotenuse =                                                  .

a-) 2                                                                                                       b-) 5

c-) 7                                                                                                       d-) 25

8.       1/cosec θ =                           .

a-) sin θ                                                                                                b-) cos θ

c-) tan θ                                                                                               d-) cot θ

9.       Cosec 45°                                               .

a-) 2                                                                                                       b-) √2

c-) √3/2                                                                                               d-) 1/√2

10.   Sec 60° =                                .                            

a-) 1/√2                                                                                               b-) √3/2

c-) 2                                                                                                       d-) None of these

11.   The side opposite to right angle is called                              .

a-) Base                                                                                               b-) Perpendicular

c-) Hypotenuse                                                                                                d-) None of these

12.   Cosec 60°=cosec (90°-30°)= sec                                                  .

a-) 30°                                                                                                   b-) 60

c-) 45°                                                                                                   d-) 90°

13.   Tan θ cot θ =                                      .

a-      1                                                                                              b-) tan θ

c-) sin θ                                                                                       d-) cos θ

14.   (sin 60)²+(cos                    )² =  1.

  a-) 30°                                                                                                 b-) 90°

 c-) 60°                                                                                                  d-) 45°

15.   If sin θ = 3/5 then cos θ =                                              .

a-) 4/5                                                                                                   b-) 5/4

c-) 3/4                                                                                                   d-) 4/3