Question

i) We should not keep audio disc close to a magnet.

ii) Cubit is not a standard unit of length.

iii) Snake forms loops while moving.

iv) Desert plants lose very less water through transpiration.

v) We can’t see through a bent pipe.

vi) A magnet is called a dipole
PLEASE ANSWER ALL QUESTIONS ​

Answer 1

Answer:

i) Magnetic recordings on tape, cassette or disc are made and destroyed by magnetic fields. The permanent magnets in headphones and compact loudspeakers can produce a strong magnetic field which may damage the tapes if they are stored in close proximity.

ii) Hand span and cubit are not used as standard units of length because their sizes vary from person to person. So, two different persons may give different measurements for the same length, which is not desirable for a standard unit.

iii) In this style of movement, a snake alternately tightens and relaxes a set of muscles along each side of its body to produce horizontal waves that travel down the body. While doing so, the snake manoeuvres its body so that the rear of each backward moving wave pushes against something resistant.

iv) Desert plants lose very little water through transpiration. The leaves in desert plants are either absent, very small, or they are present in the shape of spines. This helps in reducing loss of water from the leaves through transpiration. ... The stem is also covered with a thick waxy layer, which helps to retain water.

v) When we try to see a candle flame through a straight pipe , we can see it very clearly but, in the case of a bent pipe we cannot see it because light travels in a straight line and never bends. ... This property of light of traveling in a straight line is known as The Rectilinear propagation of light.

vi) A magnet is called a "magnetic dipole" because it has two poles(designated north and south). ... TrueFalse The magnetic force always acts perpendicularly to thedirection of motion of the moving charged particle. TrueFalse A magnetic field cannot exert a force on an unchargedparticle.

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