Physics XI Karachi Board MCQs Five Year Papers

Five Year Papers

1. As a result of constant unbalanced force a body moves with __________.

(Uniform velocity, Uniform Speed, Uniform acceleration, Variable Acceleration)

2. The range of the Ghori missile is __________.

(1500km, 2000km, 2500km)

3. The velocity of a wave of wavelength l and frequency n is given by __________.

(n/l, l/n, nl, 1/ln)

4. In aerodynamics the ratio of the velocity of the sound waves to the velocity of the source is called __________.

(Beats, Mach Number, Harmonics)

5. The structure of a crystal can be studied with the help of __________ of x-rays.

(Interference, Diffraction, Polarization)

6. The speed of sound __________.

(Increases with temperature, Decreases with temperature, Does not change with temperature)

7. Sound waves are __________.

(Longitudinal waves, Transverse waves, Not made of material medium)

8. If the vector addition of two vectors of magnitude 3 units and 4 units has a resultant of 5 units, then the angle between those two vectors is __________.

(0°, 45°, 90°)

9. A raindrop continues to fall with a uniform velocity when __________.

(its weight is balanced by air friction, its weight is balanced by air friction and upthrust, Its weight is balanced by upthrust)

10. Every point on a rotating body has the same __________.

(Linear Velocity, Angular Velocity, Angular Momentum)

11. When a body is thrown vertically upwards, it is a case of __________.

(Free fall motion, Projectile motion, Under gravity motion)

12. The characteristic of a musical sound, which distinguishes between the notes of the same pitche and intensity, is known as __________.

(Quality, Loudness, Intensity)

13. Sound wave travels faster in __________.

(Air, Water, Iron)

14. __________ of the following phenomena cannot be explained by the wave theory.

(Interference, Fiffraction, Photographic Effect)

15. In Newton’s rings, the central spot is always __________.

(Dark, Bright, red)

16. When a particle move in a circle, the angle between its linear velocity ‘v’ and angular velocity ‘w’ is always __________.

(90°, 180°, 0°)

17. They physical quantity which produces angular acceleration is called __________.

(Centripetal force, centrifugal force, Torque)

18. A string stretched between two fixed points is vibrating in one segment. The frequency generated is called __________.

(1st overtone, Fundamental Frequency, Normal harmonics)

19. The loudness of sound depends upon __________.

(Wavelength, Frequency, amplitude)

20. When the temperature of air rises, the speed of sound waves increases because __________.

(frequency of the wave increases, only wavelength increases, both the frequency and wavelength increases)

21. A monochromatic light beam is entering from one medium into another. __________ of the following properties remains unchanged.

(amplitude, velocity, wavelength, frequency)

22. The angular speed of the second hand of a watch is __________.

(p/30 rad/s, 1rad/s, prad)

23. When a sound source moves towards a stationary listener there is __________.

(an apparent increase in wavelength, an apparent increase in frequency.

A decrease in pitche.)

24. Colour in soap bubbles is due to __________.

(Polarization of light, interference of light, reflection of light)

25. A body remains at rest or continuous to move with a uniform velocity unless it is acted upon by __________.

(an unbalanced force, A force equal to the weight of the body, a force)

26. Friction is a self-adjusting force. __________.

(It increases iindefinitely with the external force, it does not increase indefinitely with the external force, it remains constant)

27. The dispersion of white light into seven different colours when passed through a prism is due to __________.

(different intensities, different amplitudes, different wavelengths)

28. A pendulum bob is swinging with simple harmonic motion. Its potential energy is maximum at __________.

(Extreme position, mean postiion, at any other point along the path)

29. When light enters into a denser medium, its velocity __________.

(Increases, Decreases , remain the same)

30. Electromagnetic waves consist of an oscillatory electric field E and an oscillatory magnetic field B. Both fields are __________.

(Perpendicular to each other, parallel to each other, parallel to the direction of propagation of the waves)

31. A particle moving with a uniform speed in a circle has __________ acceleration.

(zero, maximum, uniform)

32. If the distance between the centre of the body and the centre of the earth increases the value of g __________.

(increases, decreases, remains the same)

33. Motion under elastic restoring force is called __________.

(Simple harmonic motion, Circular motion, Linar Motion)