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1 Pick out the scalar quantity
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Power
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Torque
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Momentum
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None of these
Correct!Wrong!Power
Torque and momentum have direction so they are vectors but power has no direction therefore it is a scaler quantity.
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2 Rectangular coordinate system is also called:
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Polar coordinate system
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Cylindrical coordinate system
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Cartesian coordinate system
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None of these
Correct!Wrong!Cartesian coordinate system
Rectangular coordinate system is also called as Cartesian coordinate system .
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3 cosϴ i ̂ + sinϴ j ̂ is also called:
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Position Vector
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Vector in the direction at any angle with x-axis
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Unit vector
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None of these
Correct!Wrong!
Unit Vector
The magnitude of given vector is equal to 1, So the given vector is a unit vector.
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4 Maximum number of a components of a vector may be
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One
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Two
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Three
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Infinite
Correct!Wrong!Infinite
There are maximum three rectangular components of a vector but a vector can be resolved into infinite number of its components if they are not mutually perpendicular (rectangular) to each other.
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5 Which one is not correct for vector A =√2 i ̂ +√2 j ̂ ?
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has direction ϴ=45 with x-axis
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has magnitude 2
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has magnitude 2 and direction ϴ=45 with x-axis
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has magnitude -2
Correct!Wrong!"has magnitude -2" is the correct answer
The given vector cannot have mqagnitude equal to -2 because it has magnitude equal to 2 and makes angle of 45 degree with +ve x-axis therefore -2 cannot be correct answer.
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6 Two vectors are A=3i ̂+2j ̂-k ̂ , B=-3i ̂-2j ̂+k ̂ , then
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B is anti-parallel to A
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B is negative vector of A
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B has negative magnitude
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None of these
Correct!Wrong!B is negative vector of A
vector B is negative vector of vector A.
B=-A
B=-(3i+2j-k)
B=-3i-2j+k
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7 If vector A=Aj ̂ and vector B=Aj ̂ then AxB is :
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A^2 ij -
A^2 -
A^2k -
None of these
Correct!Wrong!
"Null vector" is the correct answer
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8 The rectangular component of force 5 N are:
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3 N and 4 N
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2.5 N and 2.5 N
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1 and 2 dyne
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None of these
Correct!Wrong!
3 N and 4 N
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9 If A.B=0 , then AxB=?
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Zero
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Null vector
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AB n^
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None of These
Correct!Wrong!
ABn^
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10 If |F1 |=|F2|=|R|,then angle between vectors is
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O˚
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30˚
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90˚
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None of these
Correct!Wrong!
12O˚ is the correct answer.
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PHYSICS XI Ch#2 Quiz 3
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