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Physics Questions with Answers Grade 11 Unit 2 - Vectors
1. Which of the following is incorrect about vectors
A. A unit vector indicate the direction of specific vector.
B. Null vector doesn't have a direction
C. Coplanar vectors are vectors which act the same plane
D. Concurrent vectors are vectors which act on the same point.
B
Null vector has no magnitude but its direction is arbitary (I.e it has head and tail at the same point .
2. Which of the following doesn't seem the result vector of
A = 4i -3j and B = (√5) +2j
A. 2
B. 8
C. 9
D. 5
C
1st find |A| and |B|
|A|=√((4²) +(-3²))= √25 =5
|B=√((√5²) +(2²))=3
|A-B</=R</=|A+B
2</=R</=8
3. Which of the following is a vector quantity?
A.Energy
B. Power
C. Electric current
D. Electric Field strength
D ( Grade 7 memories)
4. If a body moves 3i+2j-k with 3 seconds and 3i -7k , then find the body's displacement in unit vector.
A. 1/(√10) i + 3/(√10) k
B. 2i +6K
C. 9i +2j -8k
D. 9/√10i +2/√10 j - 8/√10 k
A
Stotal=3i+2j-k -(3i-7k )
= 2j +6k
|s|=√40
S=2i/√40 + 6k/√40
5. If A= 4i-3j and B=ai+j are orthogonal vectors find the value of a ?
A. 5
B. -4/3
C. 3/4
D. √3/2
C
A.B=0
4a-3=0
a=3/4
6.If |A-B=A²+B² what do you concluded from this ?
A. Vector A and B are perpendicular vectors.
B. Vector A and B are collinear vector because they act on parallel line.
C. The Cross product of the two vectors will be a null vectors.
D. The angle between Vector A and B are is 60°.
A
|A-B|=A² +B²
A² + B² -2ABcos@= A²+B²
-2ABcos@=0
Cos@=0
7.Which one of the following is correct about the cross product of vectors?
A. jxk=i
B. kxi=-j
C. Kxj = i
D. j×j =0
C
8. A boy applied a force of (2i+3j-k)N on a block .If a block moved (I+4j)m then find the work done ?
A. -4i-j+5k
B.14N
C. √42
D. 13N
B
W=F .s (i. e dot product
=14N
9. Cristiano Rinaldo bounces a ball of 3kg mass with a velocity of( 6i+8j)m/s .What is its angular momentum?
A.30kgm/s
B. (18i+24j )kgm/s
C.√30 kgm/s
D. (18i-24j)kgm/s
B
multiplying a vector via scalar quantity makes only magnitude change .
10. A mechanics adjusted nuts and bolts using a spanner of radius (√3i+√2j)m by a force of (-√2i+√3j)N.What will be the torque of the spanner
A.1 k Nm
B.(√3-√2)k
C.5 Nm
D. 25 Nm
t=r×F
(AyBz-AzBy)i +( AzBx-AxBz)j + (AxBy-AyBx)k
=1k N
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