GK-Physics Question and Answer
GK-Physics Question and Answer
22. It is more difficult to walk on a sandy road than on a concrete road because
- sand is soft and concreter is hard
- the friction between sand and feet is less than that between concrete and feet
- the friction between sand and feet is more than that between concrete and feet
- the sand is grainy but concrete is smooth
23. Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
- 0.14 m/s
- 140 m/s
- 1.4 km/s
- 14 m/s
24. Of the following properties of a wave, the one that is independent of the other is its
- amplitude
- velocity
- wavelength
- frequency
25. Flux is the unit of
- intensity of illumination
- luminous efficiency
- luminous flux
- luminous intensity
26. On a rainy day, small oil films on water show brilliant colours. This is due to
- dispersion
- interference
- diffraction
- polarization
27. Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
- move towards A
- move towards B
- move at right angles to the line joining A and B
- remain at rest
28. Materials for rain-proof coats and tents owe their water-proof properties to
- surface tension
- viscosity
- specific gravity
- elasticity
29. RADAR is used for
- locating submerged submarines
- receiving a signals in a radio receiver
- locating geostationary satellites
- detecting and locating the position of objects such as aeroplanes
30. Sound of frequency below 20 Hz is called
- audio sounds
- infrasonic
- ultrasonic
- supersonics