Category: NEET Physics Objective Questions

NEET  Physics is the very imporatant paper in the Medical Entrance EXAM. So these NEET Physics MCQs with Answers for all Concepts as per the new syllabus. Practice daily with these NEET Physics objective questions on air pollution . NEET Physics Ohms law Multiple Choice Questions

MCQs on Ohms law :

1. If a current of 5 Amperes flows through the conductor. The number of electrons per second will is
(A) 1.6 x 10^-19
(B) 3.12 x 10¹⁹
(C) 4 x 10¹⁹
(D) 7.68 x 10²⁰

Answer

Answer: (B) 3.12 x 10¹⁹

2. Ohm’s law is true for
(A) Metallic conductors at low temperature
(B) Metallic conductors at high temperature
(C) For electrolytes, when current passes through them
(D) For diode when current flows

Answer

Answer: (A) Metallic conductors at low temperature

3. An example of non-ohmic resistance is
(A) Diode
(B) Tungsten wire
(C) Carbon resistance
(D) Copper wire

Answer

Answer: (A) Diode

4. In a conductor, if 6-coulomb charge flows for 2 seconds. The value of electric current will be
(A) 3 ampere
(B) 3 volts
(C) 2 amperes
(D) 2 volts

Answer

Answer: (A) 3 ampere

5. An EMF source of 8.0 V is connected to a purely resistive electrical appliance. An electric current of 2.0 A flows through it. What is the resistance offered by the electrical appliances?
(A) 4 ohm
(B) 6 ohm
(C) 2 ohm
(D) 3 ohm

Answer

Answer: (A) 4 ohm

6. A potential difference of 10 V is applied across a conductor whose resistance is 2.5 ohm. What is the value of current flowing through it?
(A) 4 amperes
(B) 2 amperes
(C) 6 amperes
(D) 10 amperes

Answer

Answer: (A) 4 amperes

7. If the conductor resistance is 50 ohm and the current passing through it is 5 A. What is the value of potential difference?
150 V
250 V
50 V
15 V

Answer

Answer: (B) 250 V

Q8: When the length of the conductor is doubled and the area of cross-section remains the same then its resistance
(A) Remains the same
(B) Will be doubled
(C) Will become half
(D) Will increase by four times

Answer

Answer: (B) Will be doubled

Q9: The current passing through a resistor in a circuit is 1 A when the voltage across the same resistor is 10 V. What is the value of current when the voltage across the resistor is 8 V
(A) 0.8 A
(B) 8 A
(C) 80 A
(D) 18 A

Answer

Answer: (A) 0.8 A

Q10: Two resistors R₁ and R₂ with resistance 5 ohms and 10 ohms respectively are connected in series. The voltage across R₁ is 4 V. What will be the value of current across R₂.
(A) 0.8 A
(B) 8 A
(C) 80 A
(D) 18 A

Answer

Answer: (A) 0.8 A

NEET  Physics is the very imporatant paper in the Medical Entrance EXAM. So these NEET Physics MCQs with Answers for all Concepts as per the new syllabus. Practice daily with these NEET Physics objective questions on air pollution . NEET Physics Photometry Multiple Choice Questions make you feel confident in answering the question in the

MCQs on Photometry :

1. What is the power of the lamp if its luminous efficiency is 2 lumen/watt and its luminous intensity is 42 candela?
(A) 62 W
(B) 138 W
(C) 76 W
(D) 264 W

Answer

Answer: (D) 264 W

2. In a movie hall, if the distance between the screen and the projector is increased by 1% what happens to the illumination on the screen?
(A) Increases by 1%
(B) Decreases by 1%
(C) Increases by 2%
(D) Decreases by 2%

Answer

Answer: (D) Decreases by 2%

3. At a height of one meter above the centre of a circular table of diameter 4m, a bulb of 100 W hangs. If the intensity at a point on its rim is I0, then what is the intensity at the centre of the table?
(A) 2I₀
(B) I₀
(C) 2√5I₀
(D) 5√5I₀

Answer

Answer: (D) 5√5I₀

4. Lux is a unit of which of the following?
(A) Illuminance on a surface
(B) Luminous intensity of a source
(C) Luminous efficiency of the source of light
(D) Transmission coefficient of a surface

Answer

Answer: (A) Illuminance on a surface

5. Lux is equivalent to which of the following?
(A) 1 candela/m²
(B) 1 lumen/cm²
(C) 1 lumen/m²
(D) 1 candela/cm²

Answer

Answer: (A) 1 candela/m²

6. If a lamp has a luminous efficiency of Five lumen/watt and a luminous intensity of 35 candela. What is the power of the lamp?
(A) 176 W
(B) 88 W
(C) 36 W
(D) 80 W

Answer

Answer: (B) 88 W

7. The distance between a point source of light and a screen is 60 cm and now this distance is increased to 180 cm. By how many fractions will the intensity on the screen change as compared to the original intensity?
(A) 9 times
(B) 3 times
(C) (1/9) times
(D) (1/3) times

Answer

Answer: (C) (1/9) times

8. Venus looks brighter than other stars because
(A) it has no atmosphere
(B) atomic fission occurs on its surface
(C) it has a higher density than other stars
(D) it is closer to earth than most stars

Answer

Answer: (D) it is closer to earth than most stars

9. Which of the following sources of light is the inverse square law valid for?
(A) Cylindrical source
(B) Searchlight
(C) Isotropic point source
(D) All types of light sources

Answer

Answer: (C) Isotropic point source

10. Which of the following has more luminous efficiency?
(A) 40 W fluorescent tube
(B) 40 W bulb
(C) Both have the same luminous efficiency
(D) Cannot say

Answer

Answer: (A) 40 W fluorescent tube

11. A lamp hangs at a height of 4 m above a table. The lamp is lowered by 1 m. By how much will the illuminance increase?
(A) 78%
(B) 64%
(C) 40%
(D) 92%

Answer

Answer: (A) 78%

12. A point source of 100 candela is held 5 m above a sheet of blotting paper which reflects 75% of the incident light. What is the illuminance of blotting paper?
(A) 4 lux
(B) 4 phot
(C) 3 lux
(D) 3 phot

Answer

Answer: (A) 4 lux

NEET  Physics is the very imporatant paper in the Medical Entrance EXAM. So these NEET Physics MCQs with Answers for all Concepts as per the new syllabus. Practice daily with these NEET Physics objective questions on air pollution . NEET Physics Physics Physical World And Measurement Multiple Choice Questions

MCQs on Physical World And Measurement :

1. How many numbers of base SI units are there?
(A) 5
(B) 10
(C) 7
(D) 9

Answer

Answer: (C) 7

2. What is the percentage error in the measurement of the kinetic energy of a body, if there is a positive error of 50% in the speed of the body
(A) 125%
(B) 30%
(C) 50%
(D) 100%

Answer

Answer: (D) 100 %

3. What is the dimensional formula of torque and energy
(A) [ML^-3T^-2] and [MLT^-2]
(B) [ML²T^-2] and [MLT^-2]
(C) [ML²T^-2] and [ML²T²]
(D) [MLT²] and [ML²T²]

Answer

Answer: (C) [ML²T^-2] and [ML²T²]

4. Find the relative error of y, if y=x²
(A) (frac{triangle x}{x})
(B) (frac{2 triangle x}{x})
(C) (frac{(wedge x)^{2}}{x})
(D) (△x)2

Answer

Answer: (B) (frac{2 triangle x}{x})

5. Identify the physical parameters that are having the same dimensions from the below-given list:
(i) Magnetic field
(ii) Energy density
(iii) Refractive index
(iv) Young’s modulus
(v) Dielectric constant
(A) (ii) and (iv)
(B) (i) and (v)
(C) (iii) and (iv)
(D) (iv) and (iii)

Answer

Answer: (A) (ii) and (iv)

6. What is the angle between A and B, if (vec{A}+vec{B}=vec{C}) such that (vec{C}) is perpendicular to (vec{A}) and (|vec{A}|=|vec{C}|)
(A) π
(B) (frac{pi}{2})
(C) (frac{pi}{4})
(D) (frac{3 pi}{4})

Answer

Answer: (D) (frac{3 pi}{4})

7. Which the following is a dimensionless quantity
(A) Refractive index
(B) Gravitational constant
(C) Velocity
(D) Planck’s constant

Answer

Answer: (B) Gravitational constant

8. Calculate the value of the dot product of the two vectors whose magnitudes are 3 units and 4 units and their resultant is 1 unit.
(A) +6 units
(B) 0
(C) -12 units
(D) -1 unit

Answer

Answer: (C) -12 units

9. From the given three fundamental constants, select the combination that gives the dimension of length
(i) Newton’s gravitational constant (G)
(ii) Speed of light in a vacuum (C)
(iii) Planck’s constant (h)

Answer

Answer: (D) (sqrt{frac{h G}{c^{frac{3}{2}}}})

10. Following are the readings obtained while measuring the diameter of a wire by using the screw gauge0 mm is the main scale reading
52 divisions are the circular scale reading
What is the diameter of the wire if 1 mm on the main scale is equal to the 100 divisions on the circular scale
(A) 0.016 cm
(B) 0.052 cm
(C) 0.15 cm
(D) 0.05 cm

Answer

Answer: (B) 0.052 cm

NEET  Physics is the very imporatant paper in the Medical Entrance EXAM. So these NEET Physics MCQs and Answers for all Concepts as per the new syllabus. Practice daily with these NEET Physics objective questions on air pollution . NEET Physics Kepler’s Law Multiple Choice Questions

MCQs on Kepler’s Law :

1. When a planet orbits the Sun, one of the foci of the elliptical orbit is
(A) The axis
(B) The perihelion
(C) The centre
(D) The Sun

Answer

Answer: (D) The Sun

2. What has an eccentricity of zero?
(A) A straight line
(B) A large ellipse
(C) A circle
(D) A small ellipse

Answer

Answer: (C) A circle

3. An Astronomical Unit, or AU, is the average distance between
(A) The Sun and Neptune
(B) The Sun and Earth
(C) The Earth and the Moon
(D) The Sun and Mercury

Answer

Answer: (B) The Sun and Earth

4. Kepler’s second law is known as
(A) The Law of Orbits
(B) The Law of Areas
(C) The Law of Periods
(D) The Law of Gravity

Answer

Answer: (B) The Law of Areas

5. Kepler’s 2nd law deals with
(A) The shape of the planet’s orbits
(B) The speed/area the planet travels
(C) The length of time it takes the planet to orbit the sun
(D) Time travel

Answer

Answer: (B) The speed/area the planet travels

6. Kepler’s third law is known as
(A) The Law of orbits
(B) The Law of Areas
(C) The Law of periods
(D) The Law of gravity

Answer

Answer: (C) The Law of periods

7. The formula for Kepler’s third law is
(A) P³ = a²
(B) P³ = a³
(C) P² = a²
(D) P² = a³

Answer

Answer: (D) P² = a³

8. Kepler’s first law states that the orbits of the planets are oval in shape or
(A) Ellipses
(B) Perfect circles
(C) Squares
(D) triangles

Answer

Answer: (A) Ellipses

9. The Kepler’s first law is known as
(A) The law of orbits
(B) The law of areas
(C) The law of periods
(D) The law of gravity

Answer

Answer: (A) The law of orbits

10. The farther away a planet is from the sun, the …………. it takes it to orbit the sun once
(A) Longer
(B) Shorter

Answer

Answer: (A) Longer

NEET  Physics is the very imporatant paper in the Medical Entrance EXAM. So these NEET Physics MCQs and Answers for all Concepts as per the new syllabus. Practice daily with these NEET Physics objective questions on air pollution . NEET Physics Photodiode Multiple Choice Questions

MCQs on Photodiode :

1. Photodiode is used in the detection of
(A) Visible light
(B) Invisible light
(C) No light
(D) Both visible and invisible light

Answer

Answer: (D) Both visible and invisible light

2. In using a photodiode as a photodetector, it is invariably reverse biased
(A) The power consumption is much reduced compared to reverse biased condition
(B) Only when the photodiode is reverse biased the incident photons produce electron-hole pairs
(C) Only if the diode is reverse biased light variations can be converted into current variations
(D) When photons are incident on the diode, the fractional change in the reverse current is much greater than the fractional change in the forward current

Answer

Answer: (D) When photons are incident on the diode, the fractional change in the reverse current is much greater than the fractional change in the forward current.

3. The maximum wavelength of photons that can be detected by a photodiode made by a semiconductor of bandgap 2eV is about
(A) 620 nm
(B) 700 nm
(C) 740 nm
(D) 1240 nm

Answer

Answer: (A) 620 nm

4. The presence of dark current decreases the sensitivity of the photodiode to light
(A) True
(B) False

Answer

Answer: (A) True

5. Photodiodes operate by absorption of photons or charged particles and generate a flow of current in an external circuit,……….. to the incident power. The light is absorbed ……….with distance and is ………..to the absorption coefficient.
(A) Proportional, exponentially, proportional
(B) Proportional, logarithmically, inversely proportional
(C) Inversely proportional, exponentially, unrelated

Answer

Answer: (A) Proportional, exponentially, proportional

6. What is the reason phototransistor produces more current than a photodiode?
(A) A wider spectrum is accepted by the phototransistor than the photodiode
(B) The current produced by photons is amplified by the h_fe of the transistor
(C) The phototransistor can heavily doped than the photodiode
(D) At low light conditions, a photodiode is used.

Answer

Answer: (C) The current produced by photons is amplified by the h_fe of the transistor

7. In a photodiode, when there is no incident light, the reverse current is almost negligible and is called
(A) Zener current
(B) Dark current
(C) Photocurrent
(D) PIN current

Answer

Answer: (B) Dark current

8. Compared to a photo-diode, which of the listed advantages and disadvantages would be expected of a phototransistor
(A) Faster response and greater sensitivity
(B) Faster response and less sensitivity
(C) Slower response and greater sensitivity
(D) Slower response and less sensitivity

Answer

Answer: (C) Slower response and greater sensitivity

9. When a diode is forward biased, the recombination of free electron and holes produce
(A) Heat
(B) Light
(C) Radiation
(D) All the above

Answer

Answer: (D) All the above

10. The width of the depletion region is
(A) Directly proportional to the doping
(B) inversely proportional to the doping
(C) Independent of doping
(D) None of the above

Answer:

Answer

Answer: (B) inversely proportional to the doping

NEET  Physics is the very imporatant paper in the Medical Entrance EXAM. So these NEET Physics MCQs with Answers for all Concepts as per the new syllabus. Practice daily with these NEET Physics objective questions on air pollution . NEET Physics Perfectly Inelastic Collision Multiple Choice Questions

MCQs on Perfectly Inelastic Collision :

1. The coefficient of restitution e for a perfectly inelastic collision is
(A) 1
(B) 0
(C) Infinity
(D) -1

Answer

Answer: (B) 0

2. When two bodies stick together after the collision, the collision is said to be
(A) Partially elastic collision
(B) Totally elastic collision
(C) Totally inelastic collision
(D) None of the above

Answer

Answer: (C) totally inelastic

3. A completely inelastic collision is one in which the two colliding particles
(A) Are separated after collision
(B) Remain together after the collision
(C) Split into small fragments flying in all directions
(D) None of the above

Answer

Answer: (B) Remain together after the collision

4. A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is conserved?
(A) Momentum and kinetic energy
(B) Kinetic energy alone
(C) Momentum alone
(D) Neither momentum nor kinetic energy

Answer

Answer: (C) Momentum alone

5. A body of mass m moving with a constant velocity v hits another body of the same mass moving with the same velocity v but in the opposite direction and sticks to it. The velocity of the compound body after the collision is
(A) 2v
(B) v/2
(C) V
(D) Zero

Answer

Answer: (D) zero

6. A 50 g bullet moving with velocity 10 m/s strikes a block of mass 950 g at rest and gets embedded in it. The loss in kinetic energy will be
(A) 100%
(B) 95%
(C) 5%
(D) 50%

Answer

Answer: (B) 95%

7. A ball is dropped from a height 10m. The ball is embedded in sand 1m and stops, then
(A) Only momentum remains conserved
(B) Only kinetic energy remains conserved
(C) Both momentum and K.E are conserved
(D) Neither K.E nor momentum is conserved

Answer

Answer: (A) Only momentum remains conserved

8. Which of the following is not perfectly inelastic collision?
(A) Striking of two glass balls
(B) A bullet striking a bag of sand
(C) An electron captured by a proton
(D) A man jumping onto a moving cart

Answer

Answer: (C) An electron captured by a proton

9. A particle of mass m moving with velocity v strikes a stationary particle of mass 2m and stricks to it. The speed of the system will be
(A) v/2
(B) 2v
(C) v/3
(D) 3v

Answer

Answer: (C) v/3

10. If a skater of weight 3 Kg has initial speed 32 m/s and the second one of weight 4 kg has 5m/s. After the collision, they have speed (couple) 5 m/s. Then the loss in K.E is
(A) 48 J
(B) 96 J
(C) Zero
(D) None of these

Answer

Answer: (D) None of these