ECAT Pre Engineering Physics MCQ Test With Answer for Full Book

In the text book, the transistor amplifier circuit is a:

• Common emitter circuit A
• Common collector circuit B
• Common base circuit C
• Any of these D
• None of these E

A 220 V, 50 Hz. A.C. source is connected to an inductance of 0.2 H and a resistance of 20 ohm in series. What is the current in the circuit?

• 10 A A
• 5 A B
• 33.3 A C
• 3.33 A D

The concept of entropy was introduced into the study of thermodynamics in

• 1856 A
• 1865 B
• 1656 C
• 1685 D

Wavelength of light, on the average, is given by

• 10^-14m A
• 10^-10m B
• 10^-6m C
• 10^-4m D

The cause of mirage observed in deserts in bright sunlight is due to

• Refraction of light A
• Reflection of light B
• Scattering of light C
• Total internal reflection of light D

One newton is a force that produces an acceleration of 0.5 m/sec²in a body of mass:

• 2 kg A
• 3 kg B
• 4 kg C
• 8 kg D

How much time, theα-particle more massive than an electron

• 600 A
• 7000 B
• 5000 C
• 15000 D

A meter wire carraying a current of 2A is at right angle to the uniform magnetic field of 0.5 Weber/m²The force on the wire is

• 5N A
• 4N B
• 1.5N C
• 6N D

We cannot utilize the heat contents of oceans and atmosphere because

• there is no reservoir at the same temperature A
• there is no reservoir at the temperature lower than any one of two B
• there is no reservoir at the temperature higher than any one of two C
• none of them D

• 5μF A
• 10μF B
• 3μF C
• 6μF D

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

• RMS value A
• Instantaneous value B
• Valued average over a cycle C
• Zero D
• Both (B) and (C) E

A thermistor is a resistor which is:

• Light Sensitive A
• Heat Sensitive B
• Sound Sensitive C
• All of these D
• None of these E

Deep water almost runs still when surface water flow in rivers. What does it explains

• Magnus effect A
• Equation of continuity B
• Surface energy C
• Bernoulli's equation D

The e/m of an electron moving in a circular path in a magnetic field is equal to

• V/Br A
• V/B²r² B
• V²/Br² C
• V²/Br D

The locus of all the points in the same phase of vibration is called:

• Wave packet A
• Wave front B
• Wave number C
• None of them D

The area under line velocity-time graph is numerically equal to the

• speed of the body A
• acceleration of the body B
• distance covered by the body C
• none of them D

The length contraction happens only

• Opposite to the direction of motion A
• along the direction of motion B
• perpendicular to the direction of motion C
• In any direction D

The velocity of sound in air not effected by changes in

• Moisture contents in air A
• Temperature of air B
• The atmosphere pressure C
• The composition of air D

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

• Ideal gas A
• Inert gas B
• Real gas C
• None of these D

We can excite an atom by

• Bombardment of particles A
• Radiating photons B
• Providing potential difference C
• All answer are true D

If water rises 4 cm in a long, thin tube because of capillary action, then, under corresponding conditions of use, the rise (in the tube) of a liquid whose density is 2 g/cm²will be

• 1 cm A
• 2 cm B
• 8 cm C
• None D

The heat required to raise the temperature of one mole of the substance through 1 K is called

• heat capacity A
• specific heat capacity B
• molar specific heat C
• all of them D

The conventional current is the name given to current due to flow of:

• Positrons A

• Positive charges

  B

• Negative charges

  C

• Both (A) and (C)

  D

• None of these

  E

When a body moves to and fro motion, this type of motion is called

• translatory motion A
• circular motion B
• oscillatory motion C
• all of them D

When some compass needles are placed on a card board along a circle with the center at the wire, they will

• Point the direction of N-S

  A

• Set themselves tangential to the circle

  B

• Point in the direction of E-W

  C

• None of these

  D
• Point in direction of S-E E

A projectile on its path gets divided into two pieces at its highest point. Which is true?

• Momentum increases A
• Momentum decreases B
• Kinetic energy increases C
• Kinetic energy decreases D

Area under the force displacement graph gives

• Power A
• Work B
• Heat C
• Energy D

A body can have constant velocity when it follows:

• A circular path A
• A rectilinear path B
• Trajectory of a projectile C
• None of these D

In SHM, there is always a constant ratio between displacement if body and its:

• Velocity A
• Period B
• Mass C
• Acceleration D

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

• number of photoelectrons A
• size of the photoelectrons B
• charge on photoelectrons C
• K.E of photoelectrons D