Physics 9th Chap 1 Topic 10(Vector At right angled)

/35

Physics Chapter 1 (Topic 10 : Vector at right angled)

Determine, by calculation or graphically, the resultant of two
vectors at right angles?

1 / 35

When two vectors act at right angles, the resultant is found using:

A) Subtraction of magnitudes

B) Multiplication rule

C) Pythagoras theorem

D) Addition of magnitudes directly

2 / 35

If two vectors 3 N and 4 N act at right angles, the resultant is:

A) 1 N

B) 5 N

C) 12 N

D) 7 N

3 / 35

The angle between two perpendicular vectors is:

A) 180°

B) 0°

C) 45°

D) 90°

4 / 35

A 6 N force east and 8 N force north act together. Resultant is:

A) 10 N

B) 48 N

C) 14 N

D) 2 N

5 / 35

Which method is used to represent vector addition graphically?

A) Line graph method

B) Head-to-tail method

C) Bar graph method

D) Histogram method

6 / 35

In graphical method, resultant vector is drawn from:

A) Midpoint of both vectors

B) Tail of first vector to head of second

C) Head to head

D) Tail to tail

7 / 35

If two equal vectors act at right angles, resultant is:

A) Equal to one vector

B) × vector

C) Double of vector

D) Zero

8 / 35

A 5 N force east and 12 N force north act together. Resultant is:

A) 60 N

B) 7 N

C) 13 N

D) 17 N

9 / 35

The resultant of two perpendicular vectors is always:

A) Less than both vectors

B) Equal to one vector

C) Zero

D) Greater than either vector

10 / 35

If resultant of 3 N and 4 N vectors is 5 N, the angle between them is:

A) 90°

B) 45°

C) 180°

D) 0°

11 / 35

Which is correct for right-angle vector addition?

A) Scalar subtraction

B) Algebraic addition

C) Vector triangle method

D) Direct multiplication

12 / 35

A vector diagram shows two perpendicular arrows. What shape do they form?

A) Right triangle

B) Rectangle

C) Circle

D) Straight line

13 / 35

If one vector is 0, resultant of perpendicular vectors is:

A) Equal to other vector

B) Sum of both vectors

C) Zero

D) Always infinite

14 / 35

A 9 N and 12 N force act at right angles. Resultant is:

A) 108 N

B) 15 N

C) 21 N

D) 3 N

15 / 35

In vector addition, direction of resultant is found using:

A) Ohm’s law

B) Newton’s law

C) Pythagoras theorem only

D) Trigonometry (tan θ)

16 / 35

The resultant vector direction depends on:

A) Time only

B) Mass only

C) Only magnitude of one vector

D) Both magnitudes and angle

17 / 35

Which formula is correct for right-angle resultant?

A) R = AB

B) R =

C) R = A - B

D) R = A + B

18 / 35

If resultant is 0, vectors must be:

A) Parallel and equal opposite

B) Same direction

C) Perpendicular and unequal

D) Perpendicular and equal

19 / 35

Which quantity can be solved using vector addition at right angles?

A) Energy

B) Temperature

C) Displacement

D) Mass

20 / 35

A boat moves 4 m east and 3 m north. Resultant displacement is:

A) 7 m

B) 12 m

C) 5 m

D) 1 m

21 / 35

Which method gives both magnitude and direction of resultant?

A) Subtraction method

B) Scalar method

C) Algebraic method

D) Graphical method

22 / 35

Why is Pythagoras theorem used here?

A) Vectors are zero

B) Vectors are perpendicular

C) Vectors are parallel

D) Vectors are scalar

23 / 35

If vectors are perpendicular, cosine rule becomes:

A) R = AB

B) R = A - B

C) R = A + B

D) R² = A² + B²

24 / 35

Which is a real-life example of perpendicular vectors?

A) Resting object

B) Wind blowing straight

C) Falling object vertically

D) Walking north and east simultaneously

25 / 35

In graphical method, accuracy depends on:

A) Time taken

B) Color of diagram

C) Mass used

D) Scale chosen

26 / 35

If vectors are 0° apart, resultant is:

A) Sum

B) Zero

C) Product

D) Difference

27 / 35

If vectors are 180° apart, resultant is:

A) Difference

B) Sum

C) Product

D) Zero always

28 / 35

Which statement is correct?

A) Right-angle vectors use algebraic addition

B) Right-angle vectors use Pythagoras theorem

C) Right-angle vectors cancel each other

D) Right-angle vectors are scalar

29 / 35

Resultant of perpendicular vectors is always:

A) Always zero

B) Smaller than both

C) Between larger and smaller magnitude

D) Equal to sum

30 / 35

Which is correct representation in graph?

A) Circle

B) Curve

C) Straight line

D) Right triangle

31 / 35

If 8 N and 15 N are perpendicular, resultant is:

A) 17 N

B) 120 N

C) 23 N

D) 7 N

32 / 35

Which is NOT needed in vector graphical method?

A) Direction

B) Arrow

C) Scale

D) Mass

33 / 35

Direction of resultant is found using:

A) Trigonometry

B) Addition

C) Pythagoras

D) Subtraction

34 / 35

Why is vector addition important in physics?

A) It removes direction

B) It avoids units

C) It combines directional quantities

D) It simplifies scalar values

35 / 35

Which is correct conclusion?

A) Right-angle vectors require geometry

B) Vectors ignore direction

C) Vector addition is same as scalar addition

D) Vectors are always zero

Your score is