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- Question
Mach number is used in connection with the speed of
Options- A. sound
- B. aircraft
- C. spacecraft
- D. ships
- Correct Answer
- aircraft
- 1. RADAR is used for
Options- A. locating submerged submarines
- B. receiving a signals in a radio receiver
- C. locating geostationary satellites
- D. detecting and locating the position of objects such as aeroplanes Discuss
- 2. Radiocarbon is produced in the atmosphere as a result of
Options- A. collision between fast neutrons and nitrogen nuclei present in the atmosphere
- B. action of ultraviolet light from the sun on atmospheric oxygen
- C. action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
- D. lightning discharge in atmosphere Discuss
- 3. An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
Options- A. 1200 m
- B. 0.33 km
- C. 3.33 km
- D. 33 km Discuss
- 4. Stars appears to move from east to west because
Options- A. all stars move from east to west
- B. the earth rotates from west to east
- C. the earth rotates from east to west
- D. the background of the stars moves from west to east Discuss
- 5. Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to
Options- A. the heating effect of current alone
- B. hysteresis loss alone
- C. both the heating effect of current and hysteresis loss
- D. intense sunlight at noon Discuss
- 6. Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
Options- A. 1.8 km, 0.15 km
- B. 2.2 km, 0.20 km
- C. 2.8 km, 0.25 km
- D. 3.3 km, 0.30 km Discuss
- 7. On a rainy day, small oil films on water show brilliant colours. This is due to
Options- A. dispersion
- B. interference
- C. diffraction
- D. polarization Discuss
- 8. Planets are
Options- A. luminous heavenly bodies revolving around a star
- B. non-luminous heavenly bodies
- C. luminous heavenly bodies that twinkle
- D. luminous heavenly bodies that do not twinkle Discuss
- 9. Intensity of sound at a point is ____ its distance from the source.
Options- A. directly proportional to
- B. inversely proportional to
- C. directly proportional to square of
- D. inversely proportional to square of Discuss
- 10. Metals are good conductors of electricity because
Options- A. they contain free electrons
- B. the atoms are lightly packed
- C. they have high melting point
- D. All of the above Discuss
Physics problems
Search Results
Correct Answer: detecting and locating the position of objects such as aeroplanes
Correct Answer: collision between fast neutrons and nitrogen nuclei present in the atmosphere
Correct Answer: 3.33 km
Correct Answer: the earth rotates from west to east
Correct Answer: both the heating effect of current and hysteresis loss
Correct Answer: 3.3 km, 0.30 km
Correct Answer: interference
Correct Answer: non-luminous heavenly bodies
Correct Answer: inversely proportional to square of
Correct Answer: they contain free electrons
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