PHYSIC Daily Practice Problems
22 Sept 2016
Q. 1 A vector A is directed along 30° west of north direction and another vector B along 15° south of east. Their resultant cannot be in ____ directi on.
(A) North (B) East " (C) North-East (D) South : t f^l
Q.2 Two forces P and Q are in ratio P : Q = 1 :
2. If their resultant is at an angle tan- 1 ? to vector P, then angle between P and Q is:
(A)tan- 1 ^ (B) 45° (C) 30° (D) 60°
Q.3 If the speed of light (C), acceleration due to gravity(g) and pressure (P) are taken as fundamental units, the dimensions of gravitational constant (G) are
(A) c 2 g 3 p 2 (B)c°gV ! (C)c 2 g 2 p~2 (D) c°gp"3
Q.4 A force of 6kg and another of 8kg can be applied together to produce the effect of a single force of:
(A) lk g (B) 11 kg (C) 15 kg (D) 20 kg
Q.5 The horizontal component of a force of i 0 N inclined at 30° to vertical is : r- 1 0
(A) 3 N (B)5v 3 (C) 5 N (D) "t N • v j ^
Q.6 - -A particle is movin g westward with a velocity v, = 5 m/s . Its velocity changed to v2 = 5 m/s ( ^ northward . The change in velocity vector j AV=v,-v , | is :
(A) 5V2 m/s towards north east (B) 5 m/s towards north west
(C) zero (D) 5v 2 m/s towards north west
Q.7 The angle subtended by the moon's diameter at a point on the earth is about 0.524°. Use this and the fact that the moon is about 384 Mm away to find the diameter of the moon.
Q.8 Using lAU(meanearth-sundistanee)=1.5><10nmandparsecasdistanceat which 1 AUsubtendsan angle of 1 sec of arc, fmd parsec in metres, - > " ' — >
Q.9 ABCDEF is a regular hexagon in which AB represent a vector p & BC represents a vector q .Find the vectors which the CD, DE, EF, & FA represent in terms of p and q . Q.
10 A man is travelling in east direction with a velocity of 6 m/s. Rain is falling down vertically with a speed of 4 m/s. Find the velocity of rain with respect to man and its angle with the vertical using the concept that relative velocity of B w.r.t A = v R - v A .
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