JEE Questions for Physics Vectors Quiz 11 - MCQExams.com

A person aiming to reach the exactly opposite point on the bank of a stream is swimming with a speed of 0.5 m/s at an angle of 120° with the direction of flow water. The speed of water in the stream is
  • 1 m/s
  • 0.5 m/s
  • 0.25 m/s
  • 0.433 m/s
A moves with 65 km/h while B is coming back of A with 80 km/h. The relative velocity of B with respect to A is
  • 80 km/h
  • 60 km/h
  • 15 km/h
  • 145 km/h
A thief is running away on a straight road on a jeep moving with a speed of 9 m/s. A police man chases him on a motor cycle moving at a speed of 10 m/s. If the instantaneous separation of jeep from the motor cycle is 100 m, how long will it take for the policemen to catch the thief
  • 1 second
  • 19 second
  • 90 second
  • 100 second
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.

  • Physics-Vectors-95135.png
  • 2)
    Physics-Vectors-95136.png

  • Physics-Vectors-95137.png

  • Physics-Vectors-95138.png
A man sitting in a bus travelling in a direction from west to east with a speed of 40 km/h observes that the rain-drops are falling vertically down. The another man standing on ground the rain will appear
  • To fall vertically down
  • To fall at an angle going from east to east
  • To fall at an angle going from east to west
  • The information given is insufficient to decide the direction of rain
A motorboat covers a given distance in 6 hours moving downstream on a river. It covers the same distance in 10 hours moving upstream. The time it takes to cover the same distance in still water is
  • 9 hours
  • 7.5 hours
  • 6.5 hours
  • 8 hours

Physics-Vectors-95141.png
  • 0
  • 1
  • 2
  • 3
They sum of the magnitudes of two forces acting of point is 18 and the magnitude of their resultant is 12. If the resultant is at 90° with the force of smaller magnitude, what are the magnitudes of forces ?
  • 12, 5
  • 14, 4
  • 5, 13
  • 10, 8

Physics-Vectors-95144.png
  • 0, a dθ
  • a dθ, 0
  • 0, 0
  • None of these

Physics-Vectors-95146.png
  • 2R
  • 2)
    Physics-Vectors-95147.png

  • Physics-Vectors-95148.png

  • Physics-Vectors-95149.png

Physics-Vectors-95151.png

  • Physics-Vectors-95152.png
  • 2)
    Physics-Vectors-95153.png

  • Physics-Vectors-95154.png

  • Physics-Vectors-95155.png
The length of second\'s hand in watch is 1 cm. The change in velocity of its tip in 15 seconds is
  • Zero
  • 2)
    Physics-Vectors-95156.png

  • Physics-Vectors-95157.png

  • Physics-Vectors-95158.png
A particle moves towards east with velocity 5 m/s. After 10 seconds its direction changes towards north with same velocity. The average acceleration of the particleis
  • Zero
  • 2)
    Physics-Vectors-95160.png

  • Physics-Vectors-95161.png

  • Physics-Vectors-95162.png

Physics-Vectors-95164.png
  • –2 Ka2
  • 2Ka2
  • –Ka2
  • Ka2

Physics-Vectors-95166.png
  • P + Q
  • Q
  • P

  • Physics-Vectors-95167.png
  • P – Q
A metal sphere is hung by a string fixed to a wall. The sphere is pushed away from the wall by a stick.The forces acting on the sphere are shown in the second diagram. Which of the following statements is wrong.
Physics-Vectors-95169.png

  • Physics-Vectors-95170.png
  • 2)
    Physics-Vectors-95171.png

  • Physics-Vectors-95172.png

  • Physics-Vectors-95173.png
The speed of a boat is 5 km/h is still water. It crosses a river of width 1 km along the shortest possible path in 15 minutes. The velocity of the rivers water is
  • 1 km/h
  • 3 km/h
  • 4 km/h
  • 5 km/h
A man crosses a 320 m wide river perpendicular to the current in 4 minutes. If in still water he can swim with a speed 5/3 times that of the current, then the speed of the current, in m/min is
  • 30
  • 40
  • 50
  • 60

Physics-Vectors-95177.png
  • 90°
  • 180°
  • 120°
  • Zero

Physics-Vectors-95179.png
  • 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-95180.png
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true and the Reason is 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-95182.png
  • 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-95184.png
  • 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-95186.png
  • 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-95188.png
  • 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 minimum number of non coplanar vectors whose sum can be zero, is four.
Reason The resultant of two vectors of unequal magnitude can 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-95190.png
  • 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-95192.png
  • 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-95193.png
  • 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 A null vector is a vector whose magnitude is zero and direction is arbitrary.
Reason A null vector does not exist.
  • 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.
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