Practice Pakistan's most useful MCQs for competitive exams

Composition of alloys can be determined by _________________?

• (A)  Polarograph
• (B)  Chromatograph
• (C)  Refractometer
• (D)  None of these

Answer

Submitted By :Ali Uppal

The inverse Laplace transform of the function f(S) = 1/S (1 + S) is_________________?

• (A)  1 + et
• (B)  1 – et
• (C)  1 + e-t
• (D)  1 – e-t

Answer

Submitted By :Ali Uppal

A sinusoidal variation in the input passing through a linear first order system _________________?

• (A)  Becomes more oscillatory (frequency increases)
• (B)  Becomes less oscillatory (frequency decreases)
• (C)  Gets amplified (magnitude increases)
• (D)  Gets attenuated (magnitude decreases)

Answer

Submitted By :Ali Uppal

A barometer measures the _____________ pressure?

• (A)  Absolute
• (B)  Gauge
• (C)  Absolute as well as gauge
• (D)  dynamic

Answer

Submitted By :Ali Uppal

A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in_______________?

• (A)  Light intensity
• (B)  Current
• (C)  Flux density
• (D)  Voltage

Answer

Submitted By :Ali Uppal

The frequency response of a first order system, has a phase shift with lower and upper bounds given by________________?

• (A)  – ∞, π/2
• (B)  -π/2, π/2
• (C)  -π/2, 0
• (D)  0, π/2

Answer

Submitted By :Ali Uppal

Which of the following filled system expansion thermometer has the capability to measure the lowest temperature ?

• (A)  Mercury in glass thermometer
• (B)  Mercury in steel thermometer
• (C)  Alcohol in glass thermometer
• (D)  Fused metal (Na or K) in steel thermometer

Answer

Submitted By :Ali Uppal

Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change ?

• (A)  Water
• (B)  Mercury
• (C)  Methyl alcohol
• (D)  Carbon-tetrachloride

Answer

Submitted By :Ali Uppal

Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a ________________?

• (A)  Magnetic flowmeter
• (B)  Pitot tube
• (C)  Flow nozzle type flowmeter
• (D)  Turbine flowmeter

Answer

Submitted By :Ali Uppal

pH meter has ____________________?

• (A)  One cell
• (B)  Two cells
• (C)  Three cells
• (D)  No cell

Answer

Submitted By :Ali Uppal