The bar used for defining the standard metre at the International office of weights and measures at Sevres near Paris, is composed of

A)

60% platinum and 40% iridium

B)

70% platinum and 30% iridium

C)

80% platinum and 20% iridium

D)

90% platinum and 10% iridium

Correct Answer : 90% platinum and 10% iridium

Recently Updated in SI Units Questions

The unit kg/m³ is used for

A)

volume

B)

force

C)

pressure

D)

density

Correct Answer : Option (D) : density

One Newton force produces an acceleration of

A)

1 m/sec² while acting on a body of 1 kg mass

B)

1 m/sec² while acting on a body of 1 gm mass

C)

1 cm/sec² while acting on a body of 1 kg mass

D)

1 cm/sec² while acting on a body of 1 gm mass

Correct Answer : Option (A) : 1 m/sec² while acting on a body of 1 kg mass

Angular acceleration is expressed as

A)

m/s²

B)

w/s²

C)

rad/s²

D)

rad/s

Correct Answer : Option (C) : rad/s²

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