JEE Questions for Physics Vectors Quiz 3 - MCQExams.com


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  • 2)
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  • Physics-Vectors-94360.png
  • 0

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  • 2)
    Physics-Vectors-94364.png

  • Physics-Vectors-94365.png

  • Physics-Vectors-94366.png

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  • Physics-Vectors-94369.png
  • 2)
    Physics-Vectors-94370.png
  • A + B

  • Physics-Vectors-94371.png

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  • 2)
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P, Q and R are three coplanar forces acting at a point and are in equilibrium. Given P = 1.9318 kg wt, sin Q = 0.9659, the value of R is (in kg wt)
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  • 0.9659
  • 2
  • 1
  • 1/2
A body is in equilibrium under the action of three coplanar forces P,Q and R as shown in the figure. Select the correct statement.
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  • 2)
    Physics-Vectors-94383.png

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As shown in figure the tension in the horizontal cord is 30 N. The weight W and tension in the string OA in Newton are
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  • 2)
    Physics-Vectors-94389.png

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  • None of these
Two cars are moving in the same direction with the same speed 30 km/hr. They are separated by distance of 5 km, the speed of a car moving in the opposite direction if it meets these two cars at an interval of 4 min, will be
  • 40 km/hr
  • 45 km/hr
  • 30 km/hr
  • 15 km/hr
A boat crosses a river with a velocity of 8 km/hr. If the resulting velocity of boat is 10 km/hr, then the velocity of river water is
  • 4 km/hr
  • 6 km/hr
  • 8 km/hr
  • 10 km/hr
A boat takes two hours to travel 8 km and back in still water. If the velocity of water is 4 km/hr, the time taken for going upstream 8 km and coming back is
  • 2 hr
  • 2 hr 40 min
  • 1 hr 20 min
  • Cannot be estimated with the information given
A boat is moving with a velocity 3i + 4j with respect to ground. The water in the river is moving with a velocity –3i – 4j with respect to ground. The relative velocity of the boat with respect to water is
  • 8 j
  • – 6i – 8j
  • 6i + 8j
  • 5√2
A 150 m long train is moving to North at a speed of 10 m/s. A parrot flying towards South with a speed of 5 m/s crosses the train. The time taken by the parrot the cross to train would be
  • 30 s
  • 15 s
  • 8 s
  • 10 s
A river is flowing from East to West at a speed of 5m/min.A man on south bank of river, capable of swimming 10 m/min in still water, wants to swim across to river in shortest time . He should swim
  • Due North
  • Due North- East
  • Due North-East with double the speed of river
  • None of the above
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 sec
  • 19 sec
  • 90 sec
  • 100 sec
A man sitting in a bus travelling in a direction from West to East with a speed of 40 km/hr observes that the rain-drops are falling vertically down. To another man standing on ground the rain will appear
  • To fall vertically down
  • To fall at an angle going from West 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 hr moving downstream on a river. It covers the same distance in 10 hr moving upstream. The time it takes to cover the samc distance in still water is
  • 9 hr
  • 7.5 hr
  • 6.5 hr
  • 8 hr

Physics-Vectors-94401.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 is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.

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  • 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 is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.

Physics-Vectors-94404.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 is false.
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.

Physics-Vectors-94406.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 is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.

Physics-Vectors-94408.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 is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.

Physics-Vectors-94410.png
  • If Assertion is false but Reason is true.
  • 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 is false.
  • If the Assertion and Reason both are false.
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 is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.

Physics-Vectors-94412.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 is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.

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  • 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 is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.

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  • 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 is 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 is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
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 is 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 is 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 is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
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