Question
41
रसायन विज्ञान
What is the chemical symbol or formula of nitrogen gas?
(A)
Na
(B)
N2
(C)
Ni
(D)
N
Correct Answer:
N2
Explanation:
Nitrogen gas exists as a diatomic molecule, so its chemical formula is N₂.
Nitrogen gas exists as a diatomic molecule, so its chemical formula is N₂.
Question
42
सामान्य विज्ञान
Which of the following is used as a fuel along with petrol in cars?
(A)
Methane
(B)
Ethane
(C)
Butane
(D)
Ethanol
Correct Answer:
Ethanol
Explanation:
Ethanol is blended with petrol and used as a fuel. Ethanol blending in petrol is promoted in India.
Ethanol is blended with petrol and used as a fuel. Ethanol blending in petrol is promoted in India.
Question
43
भौतिक विज्ञान
What is the minimum time interval required between the original sound and the echo to hear a distinct echo?
(A)
0.01 second
(B)
0.04 second
(C)
0.1 second
(D)
0.2 second
Correct Answer:
0.1 second
Explanation:
A minimum time interval of about 0.1 seconds is required for the human ear to hear a distinct echo.
A minimum time interval of about 0.1 seconds is required for the human ear to hear a distinct echo.
Question
44
भौतिक विज्ञान
A charge of 25 coulombs flows from a battery in ten seconds. What current flows?
(A)
0.25 ampere
(B)
25 amperes
(C)
2.5 amperes
(D)
250 amperes
Correct Answer:
2.5 amperes
Explanation:
Current I = Q/t = 25/10 = 2.5 amperes.
Current I = Q/t = 25/10 = 2.5 amperes.
Question
45
रसायन विज्ञान
What happens to silver chloride in sunlight?
(A)
It turns black
(B)
It turns grey
(C)
It turns blue
(D)
It turns orange
Correct Answer:
It turns grey
Explanation:
Silver chloride decomposes in sunlight to form silver, causing it to turn grey.
Silver chloride decomposes in sunlight to form silver, causing it to turn grey.
Question
46
रसायन विज्ञान
Which of the following groups forms a homologous series?
(A)
Ethyne, propyne and butyne
(B)
Methane and ethyne
(C)
Ethane, methane and propene
(D)
Ethyne, propyne and
Correct Answer:
Ethyne, propyne and butyne
Explanation:
Ethyne, propyne and butyne are all alkynes, and successive members differ by CH₂, so they form a homologous series.
Ethyne, propyne and butyne are all alkynes, and successive members differ by CH₂, so they form a homologous series.
Question
47
जीव विज्ञान
Which hormone stimulates milk production after childbirth?
(A)
Androgen
(B)
Estrogen
(C)
Prolactin
(D)
Progestin
Correct Answer:
Prolactin
Explanation:
The hormone prolactin stimulates milk production in the mammary glands after childbirth.
The hormone prolactin stimulates milk production in the mammary glands after childbirth.
Question
48
रसायन विज्ञान
Which of the following is neither an acid nor a base?
(A)
HCl
(B)
KCl
(C)
KOH
(D)
H₂SO₄
Correct Answer:
KCl
Explanation:
KCl is a neutral salt. It is neither an acid nor a base.
KCl is a neutral salt. It is neither an acid nor a base.
Question
49
भौतिक विज्ञान
A concave lens has a focal length of 15 cm. If the object is placed 30 cm from the lens, find the image distance.
(A)
-10 cm
(B)
-15 cm
(C)
-20 cm
(D)
-18 cm
Correct Answer:
-10 cm
Explanation:
For a concave lens, f = -15 cm and u = -30 cm. Using the lens formula, the image distance v is -10 cm.
For a concave lens, f = -15 cm and u = -30 cm. Using the lens formula, the image distance v is -10 cm.
Question
50
भौतिक विज्ञान
What is the mass of a substance per unit volume called?
(A)
Pressure
(B)
Buoyant force
(C)
Force
(D)
Density
Correct Answer:
Density
Explanation:
The mass per unit volume of a substance is called density.
The mass per unit volume of a substance is called density.
Total Questions:
150
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