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JEE Questions for Physics Vectors Quiz 4 - MCQExams.com
JEE
Physics
Vectors
Quiz 4
Assertion
The scalar product of two vectors can be zero.
Reason
If two vectors are perpendicular to each other, their scalar product will be zero.
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If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
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If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
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If Assertion is true but Reason is false.
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If the Assertion and Reason both are false.
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If Assertion is false but Reason is true.
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60o , 60o , 60o
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45o , 45o , 45o
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60o , 60o , 45o
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45o , 45o , 60o
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20
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24
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50
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30
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35
Which of the following is independent of the choice of co-ordinate system?
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2)
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None of these
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2)
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0%
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2)
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0%
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2)
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In x-y plane
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In y-z plane
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In x-z plane
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Along x-axis
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2)
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0%
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Zero
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2)
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0%
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2)
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0%
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2)
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2)
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Both (a) and (b)
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None of these
A swimmer can swim in still water with speed v and the river is flowing with velocity v/2. To cross the river in shortest distance, he should swim making angle θ with the upstream. What is the ratio of the time taken to swim across the shortest time taken to swim across the shortest time to that is swimming across over shortest distance ?
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cos θ
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sin θ
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tan θ
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cot θ
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2)
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0%
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2)
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A steam boat goes across a lake and comes back (a) On a quite day when the water is still and (b) On a rough day when there is uniform air current so as to help the journey onward and to impede the journey back. if the speed of the launch on both days was same, in which case it will complete the journey in lesser time
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Case (a)
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Case (h)
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Same in both
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Nothing can be predicted
Two trains along the same straight rails moving with constant speed 60 km/hr and 30 km/hr respectively towards each other. If at time t. = 0, the distance between them is 90 km, the time when they collide is
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1 hr
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2 hr
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3 hr
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4 hr
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2)
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Position of a particle in a rectangular coordinate system is (3, 2, 5). Then, its position vector will be
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2)
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None of the above
Which of the following statement is true?
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When the coordinate axes are translated the component of a vector in a plane changes
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When the coordinate axes are rotated through some angle components of the vector change but the vector’s magnitude remains constant
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A force of 5 N acts on a particle along a direction making an angle of 60
o
with vertical. Its vertical component will be
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10N
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3N
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4N
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2.5N
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2)
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0%
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2)
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2)
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2)
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Null vector
A hail has the dimensions 10 m x 12 m x 14 m. A fly starting at one corner ends up at a diagonally opposite corner. What is the magnitude of its displacement?
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17 m
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26 m
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36 m
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21 m
100 coplanar forces each equal to 10 N act on a body. Each force makes angle m/50 with the preceding force. What is the resultant of the forces?
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1000 N
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500 N
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250 N
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Zero
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2)
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5
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2)
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