ECAT Pre Engineering Physics MCQ Test With Answer for Full Book

Acceleration produced in a body by the force varies

• inversely as the applied force A
• directly as the applied force B
• directly as the mass of the body C
• none of them D

The waves produced in a microwave oven have frequency

• 2450 Hz A
• 2450 K Hz B
• 2450 M Hz C
• 2450 G Hz D

The waves which propagate through the oscillations of material particles are known as:

• Mechanical waves A
• Electromagnetic waves B
• Any of them C
• None of them D

When a mass 'm' is pulled slowly, the spring stretches by an amount x₀,then the average force would be

• F= Kx₀ A
• F=1/2Kx₀ B
• F=2Kx₀ C
• F=4Kx₀ 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

Progressive waves of frequency 300 Hz are superimposed in produced a system of stationary waves in which adjacent nodes are 1.5 m apart. What is the speed of the progressive waves?

• 100 ms^-1 A
• 200 ms^-1 B
• 450 ms^-1 C
• 900 ms^-1 D

Average value of A.C voltage during one cycle is

• 1 A
• Zero B
• Maximum C
• Variable D

The path (or trajectory) described by a projectile is

• a parabola A
• a hyperbola B
• a circle C
• a straight line D

What is frequency of radio waves transmitted by a station, if the wavelength of those waves is 300 m?

• 1 MHz A
• 10 Hz B
• 1 GHz C
• 100000 Hz D

The projectile attains maximum horizontal range when it is projected at an angle of

• 30° A
• 45° B
• 60° C
• 75° D

Silicon can be obtained from:

• Lead A
• Uranium B
• An isotope of oxygen C
• Sand D

The power factor of resonant series circuit is

• 1 A
• 0 B
• -1 C
• 0.5 D

• 5μF A
• 10μF B
• 3μF C
• 6μF D

An induced current can be produced by:

• Constant magnetic field A
• Changing magnetic field B
• Varying magnetic feild C
• Constant electric field D
• None of these E

An axis of rotation

• Is a straight line A
• Is normal to the plane of rotation B
• Passes through pivot point O C
• All of them D

Velocity of particle executing SHM will be maximum at

• Extreme position A
• Mean position B
• b/w mean and extreme C
• None 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

Work-energy principle states that work done on the body by applied force is equal to change in:

• Potential energy A
• Kinetic nergy B
• Linear momentum C
• None of these D

When a shell explodes in mid-air, its fragments fly off in

• only one direction A
• in two direction B
• different directions C
• a particular direction D

Work done is maximum when angle between force and displacement is:

• 0° A
• 90° B
• 180° C
• None of these D

An object moving through a fluid experiences a retarding force called a

• frictional force A
• terminal force B
• opposing force C
• drag force D

The work done by the system on its environment is considered as

• positive A
• negative B
• zero C
• any one of them D

Two forces of 10 N and 8 N are applied simultaneously to a body. the maximum value of their resultant is:

• 2 N A
• - 2 N B
• 18 N C
• 36 N D

In process of annihilation of matter, the two photons produced move in opposite direction to converse

• momentum A
• charge B
• energy C
• mass D

A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which force makes with the direction of motion of a body is:

• 0° A
• 30° B
• 60° C
• 90° D

Two satellites are to be launched into space from the surface of eatth satellite 1 has mass 10 kg and volume 1500 cm3. While satellite 2 has mass 5 kg and volume 1000 m3. Assume the required escape velocities of satellite 1 and satellite 2 are v 1 and v2 , respectively. The relation between v1 and v2 is.

• Relation depends on the launch A
• V1>V2 B
• V1 = V2 C
• V1 <V2 D

A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is

• 8 J A
• 16 J B
• 4 x 10^-3J C
• 2 x 10^-3J D

The square of 0.4 is:

• Greater than 0.4 A
• Smaller than 0.4 B
• Equal to 0.4 C
• None of them D

At any point on the right bisector of the line joining two equal and opposite charges

• At electric field is zero A
• The electric potential is zero B
• The electric potential decreases with increasing distance from the centre C
• The electric field is perpendicular to the line joining the charges D

The modulus of elasticity can be written as

• stress x strain A
• strain/stress B
• 1/2 x stress x strain C
• stress/strain D