MCQs

Explanation
Sonar (Sound Navigation and Ranging) uses sound waves to detect and locate objects underwater. It works by emitting sound pulses into the water And listening for the echoes that bounce back from objects like submarines, fish, or the seafloor. Sonar is commonly used in navigation, fishing, and underwater exploration.

Explanation
Indolent means کام چور یا سست Lazy means کام سے جی چرانے والا

Explanation
The Provisional Government of the People's Republic of Bangladesh  was established on 10 April 1971.   Pakistan recognized the Government of Bangladesh on   Feb 1974. The Provisional Government of the People's Republic of Bangladesh, popularly known as the Mujibnagar Government Headed by Prime Minister  Tajuddin Ahmad ****

Explanation
To evaluate the expression 2^2n + 1 , we need to follow the order of operations (PEMDAS): Calculate the exponent: 2^2n = 2^(2*3) = 2^6 Calculate the value of 2^6: 2^6 = 64 Add 1 to the result: 64 + 1 = 65 Therefore, the correct answer is: 65

Explanation
Given expression = (3a + 2b) / (3a - 2b) = [3(a/b) + 2] / [3(a/b) - 2] = [3 x 1/3 + 2] / [3 x 1/3 - 2] = 3 / -1 =-3

Explanation
⇒  Let total examines is x. ⇒  65% of total examines has passed.  ⇒  student failed =100%−65%=35% Then, 35% of examines have failed. ⇒  Number of failures is 420 ∴  35% of x=420 ∴   35x/100 = 420  x=(420 * 100)/35 ∴  x=1200 Thus, Total number of examines are 1200.

Explanation
Given: (x1 + x2 + x3 + x4) / 4 = 16 Multiply both sides by 4: x1 + x2 + x3 + x4 = 64 ... (Equation 1) Also, (x2 + x3 + x4) / 2 = 23 Multiply both sides by 2: x2 + x3 + x4 = 46 ... (Equation 2) Now, substitute Equation 2 into Equation 1: x1 + 46 = 64 Subtract 46 from both sides: x1 = 18 Therefore, the correct answer is: 18

Explanation
Given: a^2 + b^2 = 8 ... (Equation 1) (a - b)^2 = 4 Expanding the left side of the equation: a^2 - 2ab + b^2 = 4 Now, substitute Equation 1 into this equation: 8 - 2ab = 4 Subtract 8 from both sides: -2ab = -4 Divide both sides by -2: ab = 2 So, the value of ab is 2.

Explanation
Let N of 1/12 = 3/48. Then, N = 3/48 x 12 = 3/4

Explanation
Savings % = (100 – 65) % = 35 % Saving = 35 % of Rs. 720 = Rs(35/100 ×720) = Rs. 252