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Quiz 2
Mdcat-past-papers - DUHS - Physics Quiz
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Board: DUHS | Subject: Physics |
21. In the projectile motion, the acceleration in the horizontal direction:
Remains same
Varies with time
Is zero
Is positive
22. A javelin is thrown by Arshad Nadeem at projection angle of 45° with initial velocity of 30 m/s, the range of the javelin will be: (g = 10 m/s²)
85 m
95 m
90 m
10 m
23. A body of mass 4kg is moving in a circle of radius 2m. If the body moves round a complete circle, what is the work done by the body?
16 J
Zero
16 J
6 J
24. A fisherman lifts a fish of mass 250g from rest through a vertical height of 1.8m. The fish gains a speed of 1.1 m/s. What is the energy gained by the fish?
0.15 J
4.4 J
1.3 J
4.6 J
25. Two bodies of masses 10kg and 40kg are dropped from the same height at the same time. Value of which of the following remains the same during the motion of the two bodies?
Acceleration
Kinetic energy
Potential energy
Power
26. The rate of doing work is zero, when the angle θ between force and velocity is:
θ = 60°
θ = 0°
θ = 180°
θ = 45°
27. 1 J/s is equal to:
1 K
1 N
1 T
1 Watt
28. If mass and speed of object double, kinetic energy becomes:
Eight times
Four times
Doubled
Sixteen times
29. A wheel of bike rotates from rest and achieves 6.28 radian/s in 2 seconds. What will be its angular acceleration?
1 rad/s²
1.5 rad/s²
3.14 rad/s²
6.28 rad/s²
30. The ratio of linear velocity and radius equals to:
Angular displacement
Angular velocity
Angular acceleration
Angular momentum
31. A cyclist moving on a circular track skids because:
Limiting friction ⊥ centripetal force
Limiting friction > required centripetal force
Limiting friction opposes centripetal force
Limiting friction = required centripetal force
32. Every particle of a rotating disc moves with:
Constant linear velocity
Constant angular velocity
Constant tangential velocity
Constant linear displacement
33. A body is moving with constant speed. With radius of circle 'r' and time period 'T' the centripetal acceleration is given by:
α = 2πr/T
α = 4π²r/T²
α = 4π²r/T²
α = 4π²r²/T
34. Which of the following results in production of centripetal acceleration in the body?
Change in velocity magnitude
Change in mass
Change in force magnitude
Change in direction of velocity
35. The most appropriate mathematical expression representing SHM is:
a ∝ −x
a = x
a ∝ x
a = kx
36. If the given spring of spring constant K is cut into three identical segments, the spring constant of each segment is:
1K
K/2
K/3
3K
37. In vibratory motion, the maximum displacement on either side of equilibrium position is called:
Distance
Displacement
Amplitude
Frequency
38. If a pendulum completes one cycle in half seconds, its frequency is:
1 Hz
3 Hz
2 Hz
4 Hz
39. A sound travels from one medium to another. Which one of the following characteristics of sound remains unchanged?
Amplitude
Velocity
Pitch
Quality
40. The intensity level (sound level) of faintest audible intensity is:
160 decibel
Zero decibel
140 decibel
120 decibel
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