. Which one ofthe fallowing is nat vector quantity?
4. A 30% ofte fills to the varth by gravity
C. 5N force acting on a body.
B. A car moves 5km to east direction.
2.
A qua tay nave numerin value with an appropriate unit and no direction is
D. In one month there are 720 hours.
Scalar quantity
A.
Directional vector
D. Unit Vector
Vector quantity
3.
. Or more vectors are equal if and only if they have
A. the same physical quantities
C. the same magnitude
the direction
4. A car is moving at 120km/r towards East. The underlined phrase represents:
D. displacement
B. velocity
C. acceleration
5, A football player kicks a ball at an angle of 30° to horizontal with an initial speed of 20m/s. How long wills the ball stays in air?
D. 4sec
B. 3.5 sec
C. 1.5 sec
A. 1.7 sec
6. A particle moves about an axis through the center of its path in uniform circular motion, its angular momentum is :-
C. constant
D. All
A. increase
B. decrease
7. A car travels 20.0 km due north and then 35.0 km in direction 60% west of north. Find the magnitude and direction of the car's resultant displacement.
A.
$= 55.0km
C. $= 45.0 km.
B. 5=37.5km
D. S= 48.2km.
8. A particle undergoes three consecutive displacements: d = (15 i + 30j + 12k) cm, d2 =
(231 - 14] - 5k) cm and dz= (-131 + 15)) ст.
The components of the resultant
displacement and its magnitude respectively are
A. R = (251 + 30j + 12k)and 25 c
C.R = (251 + 31) + 12k)and 31 cm
B R = (251 + 31) + 7k)and 40 cm
D.R = (251 + 30j + 12k) and 40 cm
9. If two vectors are multiplied by a dot product the resultant is
A. Scalar
B.
Vector
C. Null vector
D. Unit vector
10. At the maximum height of the projectile motion (the peak):
A. Vertical component velocity is zero.
C. Time of flight is zero
B. Vertical component of acceleration is zero.
D. NO any force is acting on an object.
11. Which one cannot be true about uniformly accelerating body?
A. Its velocity is increasing
C. Its velocity is decreasing
B. Its velocity is uniform
D. Its acceleration is constant
12. A computer hard disk starts from rest, and then speeds up with a constant angular acceleration of
300 rev/3. How many revolutions has the disk made 5s after it starts up?
A. 2550 rev
13. Given vector A, the vector 4Ä
B. 3750 rev
C. 4650 rev
D. 1250 rev
A. has a magnitude 4 times that of A.
B. points in the same direction as A.
C. has components each of which is 4 times those of A.
14. Which of the following pair are vector quantities?
D. is described by all of these.
A. time and space B. force and momentum
C. energy and time D. momentum and mass