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1) DALR = 9.8 °C, ELR = 6.8 °C; atmosphere is
a) stable
b) unstable
c) indifferent
Explanation: The atmosphere is stable when the Environmental Lapse Rate (ELR) is less than the Dry Adiabatic Lapse Rate (DALR).
2) SALR = 5.5 °C, ELR = 4.5 °C; atmosphere is
a) unstable
b) stable
c) indifferent
Explanation: The atmosphere is stable when the Environmental Lapse Rate (ELR) is lower than the Saturated Adiabatic Lapse Rate (SALR).
3) DALR > ELR > SALR
a) conditionally stable
b) latently stable
c) potentially stable
Explanation: When DALR > ELR > SALR, the atmosphere is conditionally stable. This means stability depends on the moisture content of the air.
4) Dry air is unstable when
a) ELR = DALR
b) ELR > DALR
c) ELR less than DALR
Explanation: Dry air is unstable when the Environmental Lapse Rate (ELR) is greater than the Dry Adiabatic Lapse Rate (DALR).
5) The saturated air is said to be unstable if
a) SALR = ELR
b) SALR less than ELR
c) SALR > ELR
Explanation: Saturated air is unstable if the Saturated Adiabatic Lapse Rate (SALR) is less than the Environmental Lapse Rate (ELR).
6) If ELR = SALR = DALR the atmosphere is
c) Indifferent
a) Stable
b) Instable
Explanation: If the Environmental Lapse Rate (ELR), Saturated Adiabatic Lapse Rate (SALR), and Dry Adiabatic Lapse Rate (DALR) are equal, the atmosphere is considered indifferent or neutral.
7) DALR means:
a) The rate at which temperature of an unsaturated parcel of air falls with height when made to ascend adiabatically.
b) The rate at which temperature falls with height.
c) The rate at which an ascending parcel of saturated air cools.
Explanation: The Dry Adiabatic Lapse Rate (DALR) is the rate at which the temperature of an unsaturated parcel of air decreases with height as it ascends adiabatically.
8) Surface temp is 30° C. Assuming DALR, what is the temperature at 2 km?
a) 18° C
b) 10° C
c) 42° C
Explanation: Using the Dry Adiabatic Lapse Rate (DALR) of approximately 10°C per km, the temperature at 2 km would be 20°C, surface temp is 30°C (30°C-20°C) = 10°C.
9) An Isothermal atmosphere is
c) Neutral
a) Stable
b) Unstable
Explanation: In an isothermal atmosphere, the temperature does not change with height, making it neutral with respect to stability.
10) If environmental lapse rate (ELR) is less than SALR, the atmosphere is said to be:
a) Absolutely unstable
b) Conditionally stable
c) Absolutely stable
Explanation: When the Environmental Lapse Rate (ELR) is less than the Saturated Adiabatic Lapse Rate (SALR), the atmosphere is absolutely stable.
11) DALR is approximately
a) 5 °C/km
b) 15 °C/km
c) 10 °C/km
Explanation: The Dry Adiabatic Lapse Rate (DALR) is approximately 10 °C per km.
12) SALR at mean sea level is about
a) 10 °C/km
b) 5 °C/km
c) 5 °F/km
Explanation: The Saturated Adiabatic Lapse Rate (SALR) is approximately 5 °C per km at mean sea level.
13) SALR approaches DALR
c) at -40°C
a) at 0°C
b) at -15°F
Explanation: The Saturated Adiabatic Lapse Rate (SALR) approaches the Dry Adiabatic Lapse Rate (DALR) at extremely low temperatures, around -40°C.
14) Dry air having a temperature of 35°C on surface when forced to rise adiabatically by 1 km would attain a temperature of
a) 29°C
b) 25°C
c) 45°C
Explanation: Using the Dry Adiabatic Lapse Rate (DALR) of approximately 10°C per km, a dry air parcel with a surface temperature of 35°C would have a temperature of 35°C - 10°C = 25°C after rising 1 km. Thus, the correct answer is 25°C considering the exact DALR might be slightly different in practical scenarios.
15) Inversion in the atmosphere indicates
a) Stability
b) Instability
c) Neutrality
Explanation: An inversion in the atmosphere, where temperature increases with height, indicates stability.
16) Inversion is ……….. Lapse Rate (LR)
b) Negative
a) Positive
c) Neutral
Explanation: Inversion refers to a negative lapse rate where temperature increases with height.
17) Environmental LR can be more than DALR
a) True
b) False
Explanation: The Environmental Lapse Rate (ELR) can be greater than the Dry Adiabatic Lapse Rate (DALR) under certain atmospheric conditions.
18) The process which to a large extent determines the vertical distribution of temperature in atmosphere is
a) Adiabatic
b) Isothermal
c) Isentropic
Explanation: The adiabatic process largely determines the vertical distribution of temperature in the atmosphere.
19) Rise in temperature with height is
a) Inversion
b) Lapse
c) Normal
Explanation: A rise in temperature with height is referred to as an inversion.
20) Inversion is common in
a) Post Monsoon
b) Monsoon
c) Winters
Explanation: Inversion is common in winter periods due to stable atmospheric conditions.

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