Physics Past Questions And Answers
Marching soldiers crossing a suspension bridge are usually advised to break their steps to avoid damaging the bridge owing to
- A. oscillation
- B. resonance
- C. swinging
- D. vibration
loudness increases as a vibrating tuning fork is brought nearer the end of a pipe containing air column due to
- A. resonance
- B. echo
- C. reverberation
- D. diffraction
The heat required to raise a mass of a substance through 1K is known as
- A. Specific heat capacity
- B. Specific latent heat of vaporization
- C. Capacity latent heat of fusion
- D. Heat capacity
The correct relationship between G and g in a gravitational field is given by the equation (Where the symbols have their usual meanings)
- A. g = \(\frac{GM}{R}\)
- B. g = \(\frac{GM}{R^2}\)
- C. g = \(\frac{GM^2}{R}\)
- D. g = \(\frac{GM^2}{R^2}\)
A body is projected vertically upwards with a speed of 10 ms-1 from a point 2m above the ground. Calculate the total time taken for the body to reach the ground. [g = 10ms-2]
- A. 1.00s
- B. 2.00s
- C. 2.18s
- D. 3.00s
The force on a charge moving with velocity v in a magnetic field B is half of the maximum force when the angle between v and B is
- A. 90°
- B. 45°
- C. 30°
- D. 0°
An object is placed at a point X between the focal point F and the optical centre C of a diverging lens. If F is the focal point on the other side of the lens, the image of the object is formed between
- A. F and X
- B. X and C
- C. C and F
- D. F and 2F
If the force and the velocity on a system are each reduced simultaneously by half, the power of the system is
- A. doubled
- B. reduced to a quarter
- C. reduced by half
- D. constant
In fleming's right-hand rule, the thumb, the forefinger and the middle finger if held mutually at right angles represent respectively, the
- A. motion, the field and the induced current
- B. induced current, the motion and the field
- C. field, the induced current and the motion
- D. induced current, the field and the motion
The sagging of overhead electrical wires is caused by
- A. radiation of heat.
- B. rough handling.
- C. gravitational attraction
- D. Linear expansion