ECAT Pre Computer Science Physics MCQ Test With Answer for Full Book

When a wall is pushed by a person very strongly, he has done:

• Maximum work A
• Zero work B
• Positive work C
• Negative work D

The analysis of fluid motion becomes simplified by using

• law of conservation A
• law of conservation of energy B
• both of them C
• none of them D

The sum of positive and negative peak values is called:

• Instantaneous value A
• Peak value B
• Rms valuie C
• Peak-to peak-value D
• None of these E

Mass of proton is of order of

• 10^-31gm A
• 10^-27kg B
• 10^-24gm C
• 10⁺²⁷kg D

A transformer has 100 turns on the imput side 500 turns on the output side. If rms value of input voltage are 220 V and 5A respectively. The output power is?

• 500 watt A
• 50 watt B
• 1100 watt C
• 1440 watt D

The resonance will be sharp, if the amplitude decreases rapidly at a frequency

• equal to the resonant frequency A
• slight different from the resonant frequency B
• greatly different from the resonant frequency C
• any one of them D

Heavy water is made of one oxygen atom and two atoms of:

• Protium A
• Deuterium B
• Tritium C
• Any of these D
• None of these E

Another mean of electric potential energy per unit charge is given by:

• Electric intensity

  A

• Potential gradient

  B

• Electric Flux

  C

• Potential difference

  D

• None of these

  E

Nowadays, Most of the electric energy is produced by the A.C. generators using:

• Hydal water A
• Geothermal energy B
• Solar energy C
• Biomass D
• Both (B) and (D) E

At 'resonance' the transfer of energy from deriving source to the oscillator is

• maximum A
• minimum B
• zero C
• none of them D

First law of thermodynamic is special case of

• Law of conservation of energy A
• Charle's law B
• Law of conservation of mass C
• Boyle's law D

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

• Zero A
• 0.5Ω B
• 1.1Ω C
• 5.0Ω D

Energy stored in the spring of a watch is called

• Potential energy A
• Kinetic energy B
• Nuclear energy C
• Elastic potential D

• 5μF A
• 10μF B
• 3μF C
• 6μF D

The energy acquired by a mass of 1g moving with the speed of light is

• 3 x 10⁸J A
• 9 x 10¹³J B
• 3 x 10¹³J C
• 9 x 10¹⁶J D

If the acceleration of a body is negative, then slope of the velocity-time graph will be:

• Zero A
• Positive B
• Negative C
• Infinity D

Which of the following should remain constant if no torque acts upon a body.

• Linear constant A
• Momentum B
• Angular momentum C
• Charge D

transverse wave motion is possible in:

• Air A
• A mixture of NH₃and O₂ B
• Strings C
• All of these D

The entire wave form of sinusoidal voltage is actually a set of all the:

• Positive maximum value + V_oand negative maximum value -V_o A
• Posiotive maximum value +V_o and zero B
• Zero and negative maximum value -V_o C
• Any of these D
• None of these E

Kirchhoff's first rule is also called:

• Loop rule A
• Thumb rule B
• Point rule C
• Right hand rule D
• None of these E

Computer chips are made from

• Conductors A
• Semiconductors B
• Insulators C
• Both A and B D

The rectangular components of a vector are equal in magnitude when the vector makes and angle _______with their x-component:

• 0° A
• 30° B
• 45° C
• 60° D

A body whose momentum is constant must have constant

• Acceleration A
• Velocity B
• Force C
• None of these D

Which of the following pairs does not have identical dimensions?

• Torque and energy A
• Energy and work B
• Momentum and impulse C
• Mass and moment of inertia D

With age, least distance of distinct vision:

• Increases A
• Decreases B
• Is not affected C
• None is correct D

The absolute temperature of the tripple point of water is

• 100°C A
• 4°C B
• 373 K C
• 273.16 K D

If a simple pendulum is shifted from karachi to K-2 cliff, its time period

• remains the same A
• decreases B
• increases C
• none of them D

A sinusoidally alternating voltage or current can be graphically represented by a:

• Vector A
• Rotating vector B
• Clockwise vector C
• Anticlockwise voltage vector D
• None of these E

The disorder in the system increases due to the

• removal of heat A
• addition of heat B
• removal or addition of heat C
• none of them D

Laws of motion are not valid in a system which is

• inertial A
• non-interial B
• at rest C
• moving with uniform velocity D