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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 To get 2013/14 EUEE Solutions 👇👇 https://t.me/+Y3quN3xQ789hNzE0

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