R4RIN – MCQs, Mock Tests | MCAT MCAT Physics Mcq Questions Motion and Force

The penetrating power of X-rays is comparable with that of

1. ? - rays
2. ? - rays
3. ? - rays
4. all of above

✅ Correct Answer: 3

Quality of X-rays depends upon ___________ A-filament current B-accelerating voltage C-material of the target

1. A&B
2. B&C
3. A&C
4. A B & C

✅ Correct Answer: 2

Radiation produced from TV picture tube is

1. ?-rays
2. X-rays
3. Far infrared.
4. Infrared

✅ Correct Answer: 2

In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is

1. he/ev
2. he/Vc
3. eV/h
4. impossible to predict

✅ Correct Answer: 1

The minimum wavelength of X-rays can further be reduced by

1. Reducing the pressure or cooling the target.
2. Increasing the temperature of the filament.
3. Using a target element of higher atomic number.
4. Increasing the potential difference between the cathode and the target.

✅ Correct Answer: 4

The characteristic X-rays spectrum is due to

1. The illumination of the target metal by ultra-violet radiation.
2. The bombardment of the target by protons.
3. The bombardment of target by electrons.
4. The absorption of ? radiation by the target metal.

✅ Correct Answer: 3

The minimum wavelength of X-rays produced by the bombardment of electrons on the screen of a television set where the accelerating potential is 2.0K V will be

1. 6.2 x 10-10m
2. 9.1 x 10-18m
3. 3.11 x 10-10m
4. 4 x 10-10m

✅ Correct Answer: 1

Maximum frequency in the spectrum from X-ray tube is directly proportional to the

1. Number of incident electron i.e. filament current.
2. The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated.
3. The soft target which can easily emit electrons.
4. all of above are correct.

✅ Correct Answer: 2

X-rays are diffracted by a crystal but not by a diffraction grating because

1. The ions in a crystal are well arranged.
2. The lines in a diffraction grating cannot reflect X-rays.
3. The penetration power of X-rays is high in a diffraction grating.
4. The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal

✅ Correct Answer: 4

UV radiation can be produced by

1. Heating the filament.
2. Electron excitation in the gas.
3. Ionization of atoms.
4. All the above.

✅ Correct Answer: 2

What is the velocity of a particle of mass m & de-Broglie wavelength ??

1. h/m?
2. 2h/m?
3. mh/h
4. (2hc/m?)1/2

✅ Correct Answer: 1

Wave-like characteristic of electron is demonstrated by

1. Line spectrum of atoms.
2. Production of x-rays.
3. Diffraction by crystalline solids.
4. Photoelectric effect.

✅ Correct Answer: 3

Electron cannot exist in the nucleus it is confirmed by observing that

1. It does emit ?-radiation.
2. Its size as compare to proton and neutron is very small.
3. No antiparticle of electron is present.
4. The velocity of electron must be very high according to uncertainty principle.

✅ Correct Answer: 4

In normal state of energy the incident high energy photons will be

1. Stimulated.
2. Absorbed.
3. Cause X-ray emission.
4. Cause laser production

✅ Correct Answer: 2

In laser production the state in which more atoms are in the upper state than in the lower one is called

1. Metal stable state.
2. Normal state.
3. Inverted population.
4. All the above.

✅ Correct Answer: 3

The metastable state for an atom in laser light is

1. 10-4 sec
2. 10-5 sec
3. 10-3 sec
4. 10-8 sec

✅ Correct Answer: 3

In He-Ne laser the lasing action is produced by

1. Ne only.
2. He-Ne both
3. Electrons of He.
4. Electrons Ne.

✅ Correct Answer: 1

Reflecting mirrors in laser is used to

1. Further stimulation
2. Lasing more
3. For producing more energetic lasers.
4. All

✅ Correct Answer: 1

The velocity of laser light is

1. Less than ordinary light.
2. More than ordinary light.
3. Equal to ordinary light.
4. Different for different colours or frequency.

✅ Correct Answer: 3

When body is in motion, ________ always changes.

1. its velocity
2. its acceleration
3. its position vector
4. its momentum

✅ Correct Answer: 3

A body is moving with uniform velocity. Its

1. speed changes
2. acceleration changes
3. direction of motion changes
4. displacement from origin changes

✅ Correct Answer: 4

A man is in a car is moving with velocity of 36km/hr. His speed with repect to the car is

1. 10m/s
2. 36m/s
3. zero
4. infinite

✅ Correct Answer: 3

When velocity time graph is a straight line parallel to time axis then

1. acceleration is const
2. acceleration is variable
3. acceleration is zero
4. velocity is zero

✅ Correct Answer: 3

Area under velocity time graph represent

1. force
2. displacement
3. distance
4. acceleration

✅ Correct Answer: 3

Slope of velocity time graph is

1. acceleration
2. distance
3. force
4. momentum

✅ Correct Answer: 1

Instantaneous and average velocities become equal when body

1. has zero acceleration
2. has uniform acceleration
3. has variable acceleration
4. moves in a circle

✅ Correct Answer: 1

Which law of motion is also called law of inertia?

1. 1st law
2. 2nd law
3. 3rd law
4. all 1st, 2nd and 3rd laws

✅ Correct Answer: 1

Inertia of an object is quantitative measure of its

1. volume
2. density
3. mass
4. temperature

✅ Correct Answer: 3

Newtons laws do not hold good for particles

1. at rest
2. moving slowly
3. move with high velocity
4. move with velocity comparable to velocity of light

✅ Correct Answer: 4

1st law of motion gives the definition of

1. rest
2. motion
3. velocity
4. force

✅ Correct Answer: 4

2nd law of motion gives the definition of

1. force
2. acceleration
3. velocity
4. both force and acceleration

✅ Correct Answer: 2

3rd law of motion explains

1. effect of force
2. existence of a force
3. existence of two forces
4. existence of pair of forces in nature

✅ Correct Answer: 4

Momentum depends upon

1. force acts on the body
2. mass of the body
3. velocity of the body
4. both mass and velocity of the body

✅ Correct Answer: 4

The dimension of force is

1. MLT-2
2. ML2T-2
3. ML2T2
4. ML-2T-2

✅ Correct Answer: 1

When a body moves in a straight line then its displacement coincides with

1. distance
2. force
3. acceleration is zero
4. both (a) and (b)

✅ Correct Answer: 1

Which of the following pair has same direction always?

1. force, displacement
2. force, velocity
3. force, acceleration
4. force, momentum

✅ Correct Answer: 3

Motorcycle safety helmet extends the time of collision hence decreasing the

1. chance of collision
2. force acting
3. velocity
4. impulse

✅ Correct Answer: 4

The collision between two bodies be elastic if bodies are

1. solid and soft
2. soft and elastic
3. solid and hard
4. hard and elastic

✅ Correct Answer: 3

During long jump, athlete runs before taking the jump. By doing so he

1. provide him a larger inertia
2. decreases his inertia
3. decreases his momentum
4. increases his momentum

✅ Correct Answer: 4

When car takes turn around a curve road, the passengers feel a force acting on them in a direction away from the center of the curve. It is due to

1. centripetal force
2. gravitational force
3. their inertia
4. centrifugal force

✅ Correct Answer: 3

A body is falling freely under gravity. How much distance it falls during an interval of time between 1st and 2nd seconds of its motion, taking g=10?

1. 14 m
2. 20 m
3. 5 m
4. 25 m

✅ Correct Answer: 1

What is the shape of velocity, time graph for constant acceleration?

1. straight inclined line.
2. parabola
3. inclined curve
4. declined curve

✅ Correct Answer: 1

When collision between the bodies in a system is inelastic in nature then for system

1. momentum changes but K.E remain conserve
2. K.E changes but momentum remain conserve
3. both momentum and K.E changes
4. both momentum and K.E conserve

✅ Correct Answer: 2

Which shows the correct relation between time of flight T and maximum height H?

1. H=gT2/8
2. H=8T2/g
3. H=8g/T2
4. H=gT2

✅ Correct Answer: 1

The acceleration in the rocket at any instant is proportional to the nth power of the velocity of the expelled gases. Where the value of n must be?

1. -1
2. 1
3. 2
4. -2

✅ Correct Answer: 2

Taking off rocket can be explained by

1. 1st law of motion
2. 2nd law of motion
3. Law of conservation of momentum
4. law of conservation of energy

✅ Correct Answer: 3

Which of the following is not an example of projectile motion.

1. a gas filled ballon
2. bullet fired from gun
3. a football kicked
4. a base ball shot

✅ Correct Answer: 1

What is the angle of projection for which the range and maximum height become equal?

1. tan-1 1/4
2. tan-1 4
3. tan-1 1/2
4. tan-1 2

✅ Correct Answer: 2

The thrust on the rocket in the absence of gravitational force of attraction is

1. constant
2. not constant
3. constant if the rate of ejected gases is constant
4. constant for short range rocket.

✅ Correct Answer: 1

When two bodies move toward each other with constant speeds the distance between them decreases at the rate of 6m / sec. If they move in the same direction the distance between them increases at the rate of 4m/sec. Then their speeds are

1. 5m/s, 1m/s
2. 3m/s, 3m/s
3. 6m/s, 1m/s
4. 4m/s, 2m/s

✅ Correct Answer: 1