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- Question
What is a Contact Force and explain with an example?
- Correct Answer
- A Contact force is a force applied to a body by another body that is in contact with it Contact force acts on a point of direct contact between the two objects This force can either be continuous as a continuous force or can be momentary in the form of an impulse Contact force is governed by Newton?s Laws Examples :: Contact force is responsible for most of the interactions we experience in the daily life 1 Writing your name with a pen, pushing a car up a hill, lifting an object, etc 2 Kicking a ball, hammering a nail, etc are some of the everyday examples where contact forces are at work In the first case, the force is continuously applied by the person on the car or pen or an object while in the second case the force is delivered in a short impulse Contact forces are often decomposed into orthogonal components one perpendicular to the surface in contact called the normal force, and one parallel to the surface in contact, called the friction force
- 1. What invention was first installed at a Hartford, Connecticut bank in 1889?
Options- A. Automatic teller machine
- B. Time-lock safe
- C. Burglar alarm
- D. Pay telephone Discuss
- 2. The number of electrons presents in H+ is
Options- A. zero
- B. one
- C. two
- D. three Discuss
- 3. What now-ubiquitous device was invented by Zenith engineer Eugene Polley in 1955?
Options- A. Microwave oven
- B. Remote control
- C. VCR
- D. Calculator Discuss
- 4. Which is a type of Electrically-Erasable Programmable Read-Only Memory?
Options- A. Flash
- B. Flange
- C. Fury
- D. FRAM Discuss
- 5. 'Madhubani', a style of folk paintings, is popular in which of the following states in India?
Options- A. Uttar Pradesh
- B. Rajasthan
- C. Madhya Pradesh
- D. Bihar Discuss
- 6. Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?
Options- A. By cyanobacteria
- B. By electrical discharges in the atmosphere
- C. By industrially synthesised fertilizer
- D. By denitrification Discuss
- 7. Planets do not twinkle because
Options- A. they emit light of a constant intensity
- B. their distance from the earth does not change with time
- C. they are very far away from the earth resulting in decrease in intensity of light
- D. they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable Discuss
- 8. The Manhattan Project was started by President Roosevelt in 1942 to ensure that the U.S. beat the Germans in developing a nuclear bomb. Whom did Roosevelt appoint as scientific head the Manhattan Project?
Options- A. Robert Oppenheimer
- B. James B. Conant
- C. Leslie R. Groves
- D. Vannevar Bush Discuss
- 9. In which decade was the ARRL founded?
Options- A. 1940s
- B. 1930s
- C. 1920s
- D. 1910s Discuss
- 10. Out of 900 reported species of living gymnosperms, conifers are represented by about 500 species, About 2,50,000 species of angiosperms (flowering plants) have also been reported in the world. The vast and dominant woodlands in Europe, Asia, North America and mountains such as Himalayas are wooded with
Options- A. all gymnosperms, except conifers
- B. only angiosperms
- C. only conifers
- D. angiosperms and all gymnosperms except conifers Discuss
More questions
Correct Answer: Pay telephone
Explanation:
William Gray, inventor of the pay telephone, also invented the inflatable chest protector worn by baseball umpires and catchers.
Correct Answer: zero
Explanation:
H+ is a hydrogen ion, and it is an ion because it LOST an electron. Electrons are negatively charged. When an atom gains electrons it will have NEGATIVE charges.
So it has zero electron.
Correct Answer: Remote control
Explanation:
The first wireless remote control for television was called Flashmatic. (Remember when you had to get up to change the channel?)
Correct Answer: Flash
Explanation:
It's commonly used for MP3 players, computer BIOS code and "thumb" drives. Originally developed in Japan by Toshiba, it has become quite popular for products requiring non-volatile erasable memory. Flash devices have a limited number of erase cycles (typically 10,000 to 1,000,000 cycles) so they're not as good a choice for applications in which the data changes constantly. However, since it has no moving parts (unlike a hard disk) it is an excellent choice for storing the operating code for small personal electronics like PDAs, cell phones, digital cameras, and the data in items like MP3 players.
Correct Answer: Bihar
Explanation:
Madhubani painting or Mithila painting is a style of Indian painting, practiced in the Mithila region of Bihar state, India and the adjoining parts of Terai in Nepal. Painting is done with fingers, twigs, brushes, nib-pens, and matchsticks, using natural dyes and pigments, and is characterized by eye-catching geometrical patterns. There are paintings for each occasion and festival such as birth, marriage, holi, surya shasti, kali puja, Upanayanam (sacred thread ceremony), and durga puja.
Source: http://en.wikipedia.org/wiki/Madhubani_art
Correct Answer: By denitrification
Correct Answer: they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable
Correct Answer: Robert Oppenheimer
Explanation:
Leslie R. Groves, however, was the military head of the project and the overall supremo, while Robert Oppenheimer was the scientific director. The world's first atomic bomb was exploded in the New Mexico desert on July 16, 1945.
Correct Answer: 1910s
Explanation:
On April 6, 1914, Hiram Percy Maxim proposed the formation of the American Radio Relay League.
Correct Answer: only conifers
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