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You Are On Question Answer Bank SET 2007
100351. The energy possessed by a body because of its velocity is?
Answer: Kinetic energy
100352. Kinetic energy is proportional to?
Answer: mass of the body & square of its velocity
100353. The energy possessed by a body because of its position or change in shape is called?
Answer: Potential energy
100354. What happens to the potential energy when the height of a body from the ground is doubled?
Answer: Potential energy is also doubled
100355. The energy possessed by the water collected in the reservoir of a dam?
Answer: potential energy
100356. If the velocity of a body is increased, its kinetic energy?
Answer: increases
100357. The SI Unit of?
Answer: Work - joule power - watt energy - joule
100358. Energy of one form can be changed to another form. The process is called?
Answer: Energy Transformation
100359. What is the potential energy of a body on the ground?
Answer: Zero
100360. Which is the main source of energy to earth?
Answer: Sun
100361. In the sun, which is converted into energy?
Answer: Matter
100362. What is called a device which reduces human effort?
Answer: Machine
100363. What is called the ratio of the resistance to the effort when they balance each other?
Answer: Mechanical advantage of a simple machine
100364. What is called ‘lever’?
Answer: A rigid rod which can rotate about a point fulcrum is called a lever.
100365. What is first order lever?
Answer: In first order lever Fulcrum is between the resistance and effort.
100366. Write some examples of the first order levers:?
Answer: Balance; scissors; spanner
100367. What is second order lever?
Answer: In second order lever resistance lies between the Fulcrum and effort
100368. Write examples of second order lever?
Answer: Nut cracker; Wheel barrow; Bottle opener Who proved the existence of seven colours in sunlight?
100369. What do you mean by the third order lever?
Answer: The effort is in between the resistance and the fulcrum
100370. Write examples of third order lever?
Answer: Fire tongs; forceps; ice tongs
100371. What changes is done in a dynamo?
Answer: Mechanical energy is converted into electrical energy.
100372. What is the unit of work in the C.G.S. system?
Answer: Erg
100373. When a body falls freely work is done by?
Answer: Gravitational force
100374. One watt is equal to?
Answer: One Joule / second
100375. “State the law of conservation of energy”:?
Answer: Energy can neither be created nor destroyed although it can be transformed from one form to another
100376. When is work always done on a body?
Answer: When it experience an increase in energy through a mechanical influence
100377. The unit of Speed and Velocity is?
Answer: m/sec
100378. The unit of acceleration?
Answer: metre/sec²
100379. A quantity which possess only magnitude is called a?
Answer: scalar quantity
100380. Distance, Mass, Temperature, Time etc. are examples of which quantity?
Answer: Scalar quantity
100381. A quantity which possess both magnitude and direction is known as?
Answer: Vector quantity
100382. Examples of vector quanties are?
Answer: (1) velocity (2) acceleration (3) force (4) displacement
100383. “If there is no external force, a body at rest continues to be at rest and a body in motion continues to move with uniform velocity”. This law is known as?
Answer: The Law of Inertia
100384. Who proposed the Law of Inertia?
Answer: Galileo
100385. Who proposed the Laws of Motion?
Answer: Isaac Newton
100386. The distance travelled in unit time is called?
Answer: speed
100387. The distance travelled in unit time in a specific direction is called?
Answer: velocity
100388. Impulse of force?
Answer: is the product of the force and the time during which the force acts on the body.
100389. The force acting for a very short time?
Answer: impulsive force
100390. The rate of change of velocity is called?
Answer: acceleration
100391. The kind of force that opposes relative motion is known as?
Answer: Friction
100392. The rocket lift - off is based on which law?
Answer: Newton’s 3rd Law of Motion
100393. The minimum speed which a space craft needs to escape earths gravitational force is known as?
Answer: escape speed (escape velocity is wrong because speed is a scalar quantity)
100394. The escape speed is?
Answer: 11.2 km/s or 7 miles /sec.
100395. The SI unit of force is?
Answer: Newton
100396. Which force is needed to change the direction of a moving body?
Answer: External unbalanced
100397. The momentum of a body depends on what?
Answer: Its mass and velocity
100398. Why does the cotton wick in an oil-filled lamp keep on burning?
Answer: In the cotton wick there are innumerable capillaries in which oil continues to rise.
100399. The upward force which liquid act on bodies immersed in it is called?
Answer: buoyant force
100400. How does the rise of temperature affect surface tension?
Answer: The surface tension decreases with rise of temperature.
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