JEE Questions for Physics Vectors Quiz 12 - MCQExams.com

Assertion A physical quantity cannot be called as a vector if its magnitude is zero.
Reason A vector has both, magnitude and direction.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason of false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The sum of two vectors can be zero.
Reason The vector cancel each other, when they are equal and opposite.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason of false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Two vectors are said to be like vectors if they have same direction but different magnitude.
Reason vector quantities do not have specific direction.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason of false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
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.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason of false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.

Physics-Vectors-95197.png
  • –0.2
  • 2)
    Physics-Vectors-95198.png

  • Physics-Vectors-95199.png
  • 0

Physics-Vectors-95201.png
  • 60°, 60°, 60°
  • 45°, 45° 45°
  • 60°, 60°, 45°
  • 45°, 45°, 60°

Physics-Vectors-95203.png
  • 20
  • 24
  • 50
  • 30
  • 35
Which of the following is independent of the choice of co-ordinate system

  • Physics-Vectors-95205.png
  • 2)
    Physics-Vectors-95206.png

  • Physics-Vectors-95207.png
  • None of these
A car travels 6 km towards north at an angle of 45° to the east and then travels distance of 4 km towards north at an angle of 135° to the east. How far is the point from the starting point. What angle does the straight line joining its initial and final position makes with the east

  • Physics-Vectors-95208.png
  • 2)
    Physics-Vectors-95209.png

  • Physics-Vectors-95210.png

  • Physics-Vectors-95211.png

Physics-Vectors-95213.png
  • 30°, 60°, 90°
  • 45°, 45°, 90°
  • 45°, 60° 90°
  • 90°, 135°, 135°

Physics-Vectors-95215.png

  • Physics-Vectors-95216.png
  • 2)
    Physics-Vectors-95217.png

  • Physics-Vectors-95218.png

  • Physics-Vectors-95219.png

Physics-Vectors-95221.png

  • Physics-Vectors-95222.png
  • 2)
    Physics-Vectors-95223.png

  • Physics-Vectors-95224.png

  • Physics-Vectors-95225.png

Physics-Vectors-95227.png
  • In x – y plane
  • In y – z plane
  • In x – z plane
  • Along x–axis

Physics-Vectors-95229.png

  • Physics-Vectors-95230.png
  • 2)
    Physics-Vectors-95231.png

  • Physics-Vectors-95232.png

  • Physics-Vectors-95233.png
Figure below shows a body of mass M moving with the uniform speed on a circular path of radius, R. What is the change in acceleration in going from P1 to P2
Physics-Vectors-95235.png
  • Zero
  • 2)
    Physics-Vectors-95236.png

  • Physics-Vectors-95237.png

  • Physics-Vectors-95238.png
A particle is moving on a circular path of radius r with uniform velocity v. The change in velocity when the particle moves from P to Q is (∠POQ = 40° )
Physics-Vectors-95240.png
  • 2v cos 40°
  • 2v sin 40°
  • 2v sin 20°
  • 2v cos 20°
A bus is moving with a velocity 10 m/s on a straight road. A scooterist wishes to overtake the but in 100 s. If the bus is at a distance of 1 km from the scooterist, with what velocity should be scooterist chase the bus.
  • 50 m/s
  • 40 m/s
  • 30 m/s
  • 20 m/s

Physics-Vectors-95243.png

  • Physics-Vectors-95244.png
  • 2)
    Physics-Vectors-95245.png

  • Physics-Vectors-95246.png

  • Physics-Vectors-95247.png

Physics-Vectors-95249.png

  • Physics-Vectors-95250.png
  • 2)
    Physics-Vectors-95251.png
  • Both (a) and (b)
  • 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 to that is swimming across over shortest distance
  • cos θ
  • sin θ
  • tan θ
  • cot θ

Physics-Vectors-95254.png

  • Physics-Vectors-95255.png
  • 2)
    Physics-Vectors-95256.png

  • Physics-Vectors-95257.png

  • Physics-Vectors-95258.png

Physics-Vectors-95260.png

  • Physics-Vectors-95261.png
  • 2)
    Physics-Vectors-95262.png

  • Physics-Vectors-95263.png

  • Physics-Vectors-95264.png
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
  • Case (a)
  • Case (b)
  • Same in both
  • 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
  • 1 hr
  • 2 hr
  • 3 hr
  • 4 hr

Physics-Vectors-95268.png
  • 3 sq. unit
  • 2)
    Physics-Vectors-95269.png

  • Physics-Vectors-95270.png

  • Physics-Vectors-95271.png
A man can swim with velocity v relative to water. He has to cross a river of width d flowing with a velocity u (u > v). The distance through which he is carried down stream by the river is x. Which of the following statement is correct?
  • If he crosses the river in minimum time
    Physics-Vectors-95273.png
  • x cannot be less then
    Physics-Vectors-95274.png

  • Physics-Vectors-95275.png

  • Physics-Vectors-95276.png
0:0:1


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