If vectors A = cosωt i^ + sinωt j^ and B = (cosωt/2) i^ + (sinωt/2) j^ are functions of time, then the value of t at which they are orthogonal to each other

1. t=π/4ω
2. t=π/2ω
3. t=π
4. t=0 

 

Subtopic:  Scalar Product |
 53%
From NCERT
NEET - 2015
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If the magnitude of the sum of two vectors is equal to the magnitude of the difference between the two vectors, the angle between these vectors is:

1. 90°

2. 45° 

3. 180° 

4. 0°

Subtopic:  Resultant of Vectors |
 80%
From NCERT
NEET - 2016
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If two forces of 5 N each are acting along X and Y axes, then the magnitude and direction of resultant is 

(1) 52,  π/3

(2) 52,  π/4

(3) 52,  π/3

(4) 52,  π/4

Subtopic:  Resultant of Vectors |
 85%
From NCERT
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Two forces with equal magnitudes F act on a body and the magnitude of the resultant force is F/3. The angle between the two forces is 

(1) cos11718

(2) cos113

(3) cos123

(4) cos189

Subtopic:  Resultant of Vectors |
 69%
From NCERT
PMT - 1999
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Two forces of magnitude F have a resultant of the same magnitude F. The angle between the two forces is 

(1) 45°

(2) 120°

(3) 150°

(4) 60°

Subtopic:  Resultant of Vectors |
 73%
From NCERT
PMT - 1990
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Assertion: The graph between P and Q is a straight line when P/Q is constant.
Reason: The straight-line graph means that P is proportional to Q or P is equal to a constant multiplied by Q.

Which one, of the following statements, is correct?
1. If both the assertion and the reason are true, and the reason is the correct explanation of the assertion.
2. If both the assertion and the reason are true but the reason is not the correct explanation of the assertion.
3. If the assertion is true but the reason is false.
4. If the assertion and reason are both false

Subtopic:  Co-ordinate geometry |
 77%
From NCERT
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Two forces A and B have a resultant R1. If B is doubled, the new resultant R2 is perpendicular to A. Then

1. R1=A

2. R1=B

3. R2=A

4. R2=B

Subtopic:  Resultant of Vectors |
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Two forces, 1 N and 2 N, act along with the lines x = 0 and y = 0. The equation of the line along which the resultant lies is given by:

1.  y - 2x = 0

2.  2y - x = 0

3.  y + x = 0

4.  y - x = 0

Subtopic:  Resultant of Vectors |
 55%
From NCERT
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A force of 6 N and another of 8 N can be applied together to produce the effect of a single force of -

(1)  1 N

(2)  11 N

(3)  15 N

(4)  20 N

Subtopic:  Resultant of Vectors |
 70%
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Which of the sets given below may represent the magnitude of resultant of three vectors adding to zero?

(1)  2, 4, 8

(2)  4, 8, 16

(3)  1, 2, 1

(4)  0.5, 1, 2

Subtopic:  Resultant of Vectors |
 72%
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