Type Here to Get Search Results !

# Motion in a plane -MCQ test 1

Motion in plane Class 11 CBSE - MCQ test 1

Q1. A car is moving 6 KM in East then 3 KM North and 10 KM west.What will be the magnitude of resultant displacement from origin.

5KM

3KM

1KM

7KM

Q2. A set of vectors are taken in given order of a closed polygon.Then the resultant of these vectors is .......

Scaler quantity

Unit vector

Null vector

None of these

Q3.Vector sum of two forces of 10N and 6N cannot be ..............

9N

16Nn

5N

11N

Q4. Vector sum of two forces of 10N and 6N can be ..............

2N

18N

20N

8N

Q5. Magnitude of Reusltant of two vectors a and b at angle θ is c .If position of vectors interchanged then its magnitude would be .............

Less than c.

Equal of c.

More than c.

None of these

Q6. Direction of reusltant of two vectors a and b at angle θ will .........If position of vectors interchanged.

remains same

change

Can not say

None of these

Q7. If |P+Q|=|P-Q|, then the angle between P and Q is θ. What is the value of θ?

60°

90°

P=0

Q=0.

Q8.A particle moving, eastwards with a velocity of 5m/s. In 10s, its velocity changes to 5m/s northwards. The average acceleration in this time is

0 m/s² toward South West

1/√3 m/s² toward North West

1/√2 m/s² toward North West

None of these

Q9. The resulatnt of AX0 will be equal to................

0

Zero vector

A

None of these

Q10. The unit vector associated with vector A is ......

A/A

|A|/A

A/|A|

None of these

Q11. A vector that gives the position of a point with reference to point other than origin is called.........

Coplanar Vector

Displacement Vector

Unit Vector

Equal vector

Q12. Which of following is true about null vector?

It have zero magnitude

It has no specific direction

Both a and b

None of these

Q13.Displacement vector doenot depent on ............

Direction of motion

Actual path length

Both a and b

None of these

Q14. Which of following conditions are essential for a quantity to be a vector?

Magnitude and direction.

Magnitude and addition, subtraction, multiplication by ordinary rules of algebra.

Magnitude, direction, and addition, subtraction multiplication and division by vector laws.

Magnitude, direction, and combination of vectors by ordinary rules of algebra.

Q15. How many minimum numbers of vectors in diffrent plane can be added to zero resultant?

2

3

4

None of these

Q16. A particle has a displacement of 2 units along the x-axis, 1 unit along the y- axis and 2 units along the z - axis. Then Find the resultant displacement of the particle.

3 unit

4 unit

5 unit

None of these

Q17. If i,j,k are unit vectors along x,y,z axis respectively then they are ............

Parallel to each other

Perpendicular to each other

Both a and b

None of these

Q18. The path of a particle is given by the expression y = at + bt², where a and b are constants. y is the displacement at time t. Its velocity at any instant is given by

0

at

2bt

a+2bt

Q19.For motion in two or three dimensions, the angle between velocity and acceleration vectors may have any value........

90°

120°

Between 0° and 180°

Q20. The angle between the direction of î and/(î+j) is

45°

60°

90°

Q21. A particle has initial velocity 3i+4j and accelertion 0.4i+0.3j .What will be speed after 10sec?

10 unit

72 unit

7 unit

7√2 unit

Q22. A particle moves in the xy plane with a constant acceleration of 1.5 m/s² in the direction making an angle of 37° with the x axis at t=0 the particle is at the origin and its velocity is 8 m/s along the x axis

49.6m,8.2m

48.6m,9.2m

46.6m,2.2m

41.6m,7.2m

Q23. if |A+B|=|A| then ............

B=0

A and B are perpendicular.

A-B<0

A and B are anti perallel.

Q24. The coordinates of a particle moving in XY plane at any instant of time t are x=4t² and y=3t². The speed of the particle at that instant t is

2t

0

5t

10t

Q25.If the angle between two forces increases, the magnitude of their resultant

remains same

frist increases then decreases

increases

decreases