Showing 541–550 of 654 questions
If a number is multiplied by 0.5 and then by 4, what percentage of the original number is the result?
A
100%
B
150%
C
200%
D
250%
Explanation:
Let original = x. After operations: x × 0.5 × 4 = 2x = 200% of x
In a class, the ratio of boys to girls is 3:2. If there are 45 students in total, how many girls are there?
Explanation:
Boys:Girls = 3:2, total parts = 5. Girls = (2/5) × 45 = 18
A password must contain at least one uppercase letter, one digit, and be at least 8 characters long. Which is valid?
A
Abc1234
B
ABC12345
C
abcd1234
D
Abcdefgh
Correct Answer:
B. ABC12345
Explanation:
ABC12345 has uppercase (A,B,C), digit (1,2,3,4,5), and is 8+ characters long
What is the difference between var, let, and const in JavaScript?
A
No difference
B
var is function-scoped, let/const are block-scoped, const cannot be reassigned
C
const cannot be used
D
let is obsolete
Correct Answer:
B. var is function-scoped, let/const are block-scoped, const cannot be reassigned
Explanation:
var has function scope, let/const have block scope. const prevents reassignment but let allows it
In the number 52,347, what is the place value of 3?
Explanation:
In 52,347, the digit 3 is in the hundreds place, so its place value is 300
What is 15% of 80?
Explanation:
15% of 80 = 0.15 × 80 = 12
If a car travels at 60 km/h for 2 hours and 40 km/h for 3 hours, what is the average speed?
A
48 km/h
B
50 km/h
C
52 km/h
D
54 km/h
Correct Answer:
A. 48 km/h
Explanation:
Total distance = 60×2 + 40×3 = 120 + 120 = 240 km. Total time = 2 + 3 = 5 hours. Average = 240/5 = 48 km/h
If the cost price of an item is Rs. 400 and it is sold at a loss of 15%, what is the selling price?
A
Rs. 340
B
Rs. 350
C
Rs. 360
D
Rs. 380
Correct Answer:
A. Rs. 340
Explanation:
Loss = 15% of 400 = 60. Selling Price = 400 - 60 = Rs. 340
Two pipes A and B can fill a tank in 12 hours and 18 hours respectively. If both pipes are opened together, how long will it take to fill the tank?
A
6.5 hours
B
7.2 hours
C
8.5 hours
D
9 hours
Correct Answer:
B. 7.2 hours
Explanation:
Rate of A = 1/12 per hour. Rate of B = 1/18 per hour. Combined rate = 1/12 + 1/18 = 3/36 + 2/36 = 5/36. Time = 36/5 = 7.2 hours
A person spends 30% of his income on food, 40% on rent, and 20% on utilities. If his remaining income is Rs. 5,000, what is his total income?
A
Rs. 45,000
B
Rs. 50,000
C
Rs. 55,000
D
Rs. 60,000
Correct Answer:
B. Rs. 50,000
Explanation:
Percentage spent = 30 + 40 + 20 = 90%. Remaining = 10% = 5,000. Total income = 5,000 × 10 = Rs. 50,000
