1. Solar cookers
2. Ophthalmoscope
3. Reflector for head light
4. Rear view mirror
Option “4” is correct. A convex mirror provides for a larger field of view than a plane mirror. They are used whenever a mirror with a large field of view is needed. For example, the passenger-side rear view mirror on a car is convex.
362. Barometer was invented by-
1. Evangelista Torricelli
2. Charles Xavier Thomas
3. Edward Teller
4. Gustav Tauschek
Option “1” is correct. Evangelista Torricelli is universally accepted as inventor of Barometer. Charles Xavier Thomas invented mechanical calculator. Edward Teller is known as “the father of the hydrogen bomb”. Gustav Tauschek developed numerous improvements for punched card-based calculating machines.
363. ______ is the perpendicular distance between point of application of force and axis of rotation.
1. Moment arm
2. Moment of Inertia
3. Altitude
4. Base
Option “1” is correct. The moment arm or lever arm is the perpendicular distance between the line of action of the force and the center of moments. Moment Arm is the perpendicular distance between point of application of force and axis of rotation.
364. Which among the following is not a unit of distance?
1. Light year
2. Candela
3. Astronomical unit
4. Parsec
Option “2” is correct. Longsec is not the unit of distance.
365. The apparent weight of a person in a lift which is moving down with uniform acceleration is _______.
1. greater than the weight when the person is stationary
2. twice the weight when the person is stationary
3. less than the weight when the person is stationary
4. same as the weight when the person is stationary
Option “3” is correct. The apparent weight of a person in a lift which is moving down with uniform acceleration is less than the weight when the person is stationary.
366. Who invented Rocket?
1. Rich K Goyle
2. E M Forster
3. Robert Goddard
4. James Anderson
Option “3” is correct. Robert Hutchings Goddard (October 5, 1882 – August 10, 1945) was an American engineer, professor, physicist, and inventor who is credited with creating and building the world’s first liquid-fueled rocket.
367. In which of the following processes is energy released?
Option “1” is correct. Respiration is the process in which energy is released.
368. The technique of collecting information about an object from a distance without making physical contact with it is –
1. Remote sensing
2. Remote control
3. Remote accessing
4. Space Shuttle
Option “1” is correct. The technique of collecting information about an object from a distance without making physical contact with it, is Remote Sensing.
369. The light with the shortest wavelength is-
1. Red
2. Yellow
3. Blue
4. Violet
Option “4” is correct. Wavelength of red colour is largest and violet colour has the shortest wavelength.
370. The cooling by a desert cooler is based on-
1. Hot air replacement
2. Air dehydration
3. Evaporative cooling
4. Air rehydration
Option “3” is correct. The cooling by a desert cooler is based on evaporative cooling. These coolers are also known as swamp coolers.
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