Showing 21–30 of 79 questions
Q.21
Hard
General Science
At what temperature do Celsius and Fahrenheit scales show the same numerical value?
A
-20°
B
-40°
C
0°
D
-10°
Explanation:
Using the formula F = (9/5)C + 32, when C = F, we get C = (9/5)C + 32, solving gives C = -40°
A person travels 60 km by train at 40 km/h and 30 km by bus at 30 km/h. What is the average speed for the entire journey?
A
32 km/h
B
35 km/h
C
36 km/h
D
38 km/h
Correct Answer:
C. 36 km/h
Explanation:
Time by train = 1.5 h; Time by bus = 1 h; Total distance = 90 km; Total time = 2.5 h; Average = 90/2.5 = 36 km/h
If x² - 5x + 6 = 0, what are the values of x?
A
2 and 3
B
2 and 4
C
-2 and -3
D
1 and 6
Correct Answer:
A. 2 and 3
Explanation:
x² - 5x + 6 = (x-2)(x-3) = 0; x = 2 or x = 3
A discount of 10% is given on an item, and then another 15% discount is applied. What is the overall discount percentage?
A
24%
B
25%
C
23.5%
D
26.5%
Explanation:
After 10% discount: 90%; After 15% on 90%: 90% × 85% = 76.5%; Overall discount = 23.5%
Two pipes can fill a tank in 12 hours and 15 hours respectively. If both are opened together, in how many hours will the tank be filled?
A
6.67 hours
B
7 hours
C
7.5 hours
D
8 hours
Correct Answer:
A. 6.67 hours
Explanation:
Work rate = 1/12 + 1/15 = 5/60 + 4/60 = 9/60 = 3/20; Time = 20/3 ≈ 6.67 hours
A sum of money becomes Rs. 1800 in 2 years and Rs. 2100 in 4 years at simple interest. What is the principal?
A
Rs. 1200
B
Rs. 1350
C
Rs. 1500
D
Rs. 1600
Correct Answer:
C. Rs. 1500
Explanation:
Interest in 2 years = A₂ - A₄/2 = 1800 - 1050 = 750; Interest per year = 375; Principal = 1800 - 750 = 1500
Q.27
Hard
Current Affairs (Railway)
Which railway zone covers the maximum area in India?
A
Central Railway
B
Eastern Railway
C
South Eastern Railway
D
South Western Railway
Correct Answer:
C. South Eastern Railway
Explanation:
South Eastern Railway covers the maximum geographical area among all railway zones.
Q.28
Hard
Current Affairs (Railway)
Which railway line was the first to introduce premium services in India?
A
Rajdhani Express
B
Shatabdi Express
C
Duronto Express
D
Tejas Express
Correct Answer:
A. Rajdhani Express
Explanation:
Rajdhani Express was the first premium service introduced by Indian Railways.
Q.29
Hard
Current Affairs (Railway)
What is the standard platform height on Indian railways?
A
500 mm
B
750 mm
C
1000 mm
D
1200 mm
Correct Answer:
B. 750 mm
Explanation:
The standard platform height on Indian railways is 750 mm above rail level.
Q.30
Hard
Current Affairs (Railway)
Which railway zone was recently formed in 2019?
A
Guwahati Railway
B
South Coast Railway
C
East Coast Railway
D
West Central Railway
Correct Answer:
B. South Coast Railway
Explanation:
South Coast Railway was formed as a new railway zone in 2019 with headquarters in Visakhapatnam.
