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Learn CDS MCQs with answers [Page -10 of Department 156]
"Pressure" is the ratio of mass to area. So, for any given area, the one with more mass pressing on it will experience a higher pressure.
As you go more deeply into the atmosphere OR earth itself, you are putting more and more mass over you. For the same unit area therefore, the pressure, (mass/area) increases.
Hence, the lowest layer will always have the highest pressure i.e, inner core.
-108) At what time, in minutes, between 3 o'clock and 3.25 pm, both the needles of the clock will coincide each other?
(A) 13 (4/11)
(B) 14 (4/11)
(C) 15 (4/11)
(D) 16 (4/11)
Correct Answer - Option
(D)
Explanation :
At 3 o'clock, the minute hand is 15 min. spaces apart from the hour hand.
To be coincident, it must gain 15 min. spaces.
55 min. are gained in 60 min
15 min. spaces are gained in 60/55 x 15 = 16 4/11 min
The hands are co-incident at 16 (4/11) past 3.
-107) How much does a watch gain or lose per day, if its hands coincide every 64 minutes?
(A) Gain 92 min
(B) Lose 9 min
(C) Lose 34 (5/11) min
(D) Lose 34 (5/11) min
Correct Answer - Option
(D)
Explanation :
55 min. spaces are covered in 60 min.
60 min. spaces are covered in (60/55 × 60) min = 65 5/11 min
Loss in 64 min = (65 5/11 - 64) = 16/11 min
Loss in 24 hrs= (16/11 × 1/64 × 24 × 60) min = 32 (8/11) min.
-106) At what time between 7.02 and 8.02 will the hands of a watch be in the straight line but no together?
(A) 5 (3/11) min past 7
(B) 5 (5/11) min past 7
(C) 5 (3/11) min past 7
(D) 43 min past 7
Correct Answer - Option
(B)
Explanation :
When the hands of the clock are in the same straight line but not
together, they are 30 minute spaces apart.
At 7 o'clock, they are 25 min. spaces apart.
Minute hand must gain only 5 min. space
55 min. spaces are gained in 60 min.
5 min. spaces are gained in (60/55 × 5) min = 5 (5/11) min.
Required time = 5 (5/11) min. past 7.
-105) When the time in the clock is 7.20 pm, then the angle between the hands of the clock is
(A) 80
(B) 90
(C) 100
(D) 110
Correct Answer - Option
(D)
Explanation :
At 7 o’ clock, the hour hand is at 210 degrees from the vertical.
In 20 minutes,
Hour hand = 210 + 20 x (0.5) = 220 (The hour hand moves at 0.5 dpm)
Minute hand = 20 x (6) = 120 (The minute hand moves at 6 dpm)
Difference or angle between the hands = 220 - 120 = 100 degree
-104) At what angle the hands of a clock are inclined at 40 minutes past 2?
(A) 150°
(B) 160°
(C) 170°
(D) 180°
Correct Answer - Option
(B)
Explanation :
At 2 o’ clock, the hour hand is at 60° from the vertical.
In 40 minutes,
Hour hand = 60 + 40 x (0.5) = 80° (The hour hand moves at 0.5 dpm)
Minute hand = 40 x (6) = 240° (The minute hand moves at 6 dpm)
Difference or angle between the hands = 240 - 80 = 160°
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