Physics 4

Q-1 A stone dropped from on Aeroplane in an example of
(a) Projectile
(b) Range
(c) Momentum
(d) None
Q-2 y = kx2 is eq. of
(a) Parabola
(b) Ellipse
(c) Hyperbola
(d) None
Q-3 What is the path followed by projectile ?
(a) Elliptical
(b) Parabolic
(c) Hyperbolic
(d) None
Q-4 At q = 900, the value of R is, Here R in Horizontal Range
(a) 1
(b) 0
(c) 2
(d) 3
Q-5 Sin (1800 – 3x) =?
(a) Sin 2x
(b) Sin 3x
(c) Sin 4x
(d) – Sin 3x
Q-6 When angle is 900, then value of time of flight is
(a) 2a/g
(b) 2b/g
(c) 2u/g
(d) None
Q-7 When a body slide from the inclined blame the value of acceleration is
(a) g
(b) Sin Ө
(c) – g sin Ө
(d) 0
Q-8 When a particle is projected from earth with velocity V0, then what will be its horizontal components of velocity.
(a) V0 Cos Ө
(b) V0 Sin Ө
(c) V Cos Ө
(d) None
Q-9 What is max. horizontal Range?
(a) 4h
(b) 5h
(c) 9h
(d) 10h
Q-10 Path followed by the projectile during it flight is ------
(a) Trajectory
(b) Horizontal Range
(c) Momentum
(d) None
Q-11 At What pt. in its path does a stone have zero speed?
(a) At ground
(b) At highest pt.
(c) a & b
(d) None
Q-12 At which angle a stone should be projected, so that it have max. horizontal Range
(a) 600
(b) 900
(c) 450
(d) None
Q-13 What is unit of Ө?
(a) Radian
(b) Steradian
(c) Rods-1
(d) None
Q-14 In w = Ө/t, w is
(a) Angular Displacement
(b) Angular Speed
(c) Time
(d) None
Q-15 In circular motion the relation S = V0t can be written on
(a) Ө = V0t
(b) Ө0 = Vt
(c) Ө = w0t
(d) None
Q-16 What is unit of angular acceleration.
(a) Radian s-2
(b) Radian s-3
(c) Radian s-4
(d) None
Q-17 What happen to angular acceleration if velocity is constant?
(a) 0
(b) 1
(c) 2
(d) 9
Q-18 In circular motion, V = V0 + at can be written as?
(a) w = w2 + at
(b) w = w0 + at
(c) w2 = w + at
(d) None
Q-19 T = 1/ ?
(a) n
(b) n2
(c) n3
(d) None
Q-20 Angular velocity is
(a) Axial vector
(b) Rotational vector
(c) Co-initial vector
(d) None
Q-21 In Ө = l/r, l is
(a) Radius
(b) Arc
(c) Angle
(d) None
Q-22 Lt Δy/Δt =?
Δt ®0
(a) dy/dt
(b) d2y/dt2
(c) Δy/Δt
(d) None
Q-23 When V = 1205 rpm. Here rpm stands for
(a) Round per minute
(b) Revolution per minute
(c) Revolver per minute
(d) None
Q-24 A stone is thrown vertically upward with velocity 10ms-1 which make an angle of 600 with horizontal, find Time of flight.
(a) Ö3
(b) Ö5
(c) Ö41
(d) Ö92
Q-25 The fly wheel of a generator makes 360 revolution in one minute. Find its angular velocity.
(a) 130π rad S-1
(b) 120 π rad S-1
(c) 125 π rad S-1
(d) None

Answers:
1(a) Projectile
2(a) Parabola
3(b) Parabolic
4(b) 0
5(b) Sin 3x
6(c) 2u/g
7(b) Sin Ө
8(a) V0 Cos Ө
9(a) 4h
10(a) Trajectory
11(b) At highest pt.
12(c) 450
13(a) Radian
14(b) Angular Speed
15(c) Ө = w0t
16(a) Radian S-2
17(a) 0
18(b) w = w0 + at
19(a) V
20(a) Axial vector
21(b) Arc
22(a) dy/dt
23(b) Revolution per minute
24(a) Ö3
25(b) 120 π rad S-1
Reason
24 Here we use
T = 2V0 Sin d /g
2(10) Sin 600 / 9.8
2(10) Ö3/9.8 = 10 Ö3/9.8 = 5 Ö3/4.9
25 V = 360 revolution per minute
= 360/60 = 60 rotation per second
Since W = 2 π V = 2π(60) = 120 π red /S