VECTOR-Physics Academic & Admission Care

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DHAKA UNIVERSITY
Admission Test 2014-15
Ans: of PHYSICS portion set-1

What is the angle between two vectors A ⃗=3.0i ̂-3.0j ̂and B ⃗=5.0i ̂+5.0k ̂?
SOLVE: cos⁡θ=(15+0+0)/(√((9+9))×√((25+25) ))=15/(3√2×5√2)=15/(15×√2×√2)=1/2 〖=cos〗⁡60 ∴θ=60˚

1.A, 2.B, 3.B, 4.B, 5.C, 6.D, 7.C, 8.D, 9.C, 10.A, 11.B, 12.A, 13.D, 14.B, 15.C, 16.C, 17.D, 18.A, 19.C, 20.A, 21.C, 22.B, 23.B, 24:B, 25.B, 26.C, 27.C, 28.B, 29.D, 30.D

Decimal Prefixes.....................