1.Establish a relationship between British system and metric system of mass
Ans.1 lb= 453.59 g
1 lb = 453.59 × 1 g
= 453.59 × 1/1000 kg
1lb = 0.45359 kg
Multiplying both sides by thousand,
1000× 1 lb = 1000× 0.45359 kg
1000 lb = 453.59 kg.
So, the the correct option is (C)
1lb ≈0.454 kg
2.The International Bureau of Weights and Measures at Sevres is located in
Ans.paris , capital city of France.
3.Which year had february of 29 days
Ans.1600.
Those century years which are divisible by 400 are leap years.
4.Which is not a derived unit
Ans.A (ampere) is unit of current which is a fundamental quantity.
So correct option is (A).
5.kg.m.s/s² is the unit of
Ans.kg.m.s/s²
=kgms/s.s
= kgm/s
= kg. m/s
= mass × velocity
= momentum
So, the correct option is (D).
6. 50 Angstrom is equal to
Ans. 50A°
= 50× 1A°
= 50× 10-¹⁰ m
= 5×10 × 10-⁶-⁴ m
= 5×10¹ × 10-⁴ × 10-⁹ m
= 5× 10¹-⁴ × 1μm
= 5× 10-³ μm
= 5/1000 μm
= 0.005 μm
So, the correct option is (A).
7.1 Mean Solar day is equivalent to
Ans.1mean solar day=86400 s.
The correct option is (D).
8.The distance of a star from the earth is 8.33 light years.The distance in metre is
Ans. Distance= 8.33 light years.
= 8.33 × 1 light year
=8.33× 9.46×10¹⁵ m
=78.8018 × 10¹⁵ m
=7.88018× 10 ×10¹⁵m
=7.88018 × 10¹⁶m
The correct option is (C)
9.The frequency of a pendulum is 0.5 Hz.Then which statement is correct
Ans. Frequency= 0.5 Hz
T= 1/f
T= 1/0.5 Hz
= 2 s
Time period of a pendulum is 2 second. It means that it is a seconds pendulum. We also know that length of a seconds pendulum is 0.99 metres.
So, the correct option is (C).
10.The size of a bacteria is 1 micron.The number of bacteria in 5.1 km length is
Ans. Size of a bacteria= 1μm
Length=5.1 km
Number of bacteria in 5.1km length=5.1 km/size of a bacteria.
=5.1km / 1μm
= 5.1 km / 10-⁶ m
= 5.1 km × 10⁶ m-¹
= 5.1 × 10³ m ×10⁶ m-¹
=5.1 × 10³+⁶ m¹-¹
= 5.1 × 10⁹ m⁰
= 5.1 × 10⁹ × 1
= 5.1 × 10⁹
=5100000000.
So, the correct option is (A).
No comments:
Post a Comment
Thanks