NEET UG Physics Experiments MCQs

MCQ

1. When the edge of the circular scale lies to the left of O mark on the main scale, when the stud and spindle touch each other, Then what will be the zero error ?
(A) zero error is negative (B) zero error is positive
(C) zero error does not exist (D) zero correction is negative

2. Whe the edge of the circular scale lies to the right of the O mark on the main scale, when the stud and the spindle touch each other,then what will be the zero error ?(A) zero correction is negative (B) zero error is negative
(C) zero error does not exist (D) zero correction is positive

3. When the screw and stud touch each other, the edges of a certain screw gauge is on left of the O mark on the main scale and the 96th division of the circular scale coincides with the circular line of graduation then what is the value of zero error ?
(A) zero error = + 0.96 mm (B) zero error = – 0.96 mm
(C) zero error = + 0.04 mm (D) zero error = – 0.04 mm

4. When the screw and stud touch each other, the edge of a certain screw gauge is to the right of the O mark on the main scale and 5th division of the circular scale coincides with the line of graduation, then what is the value of zero error ?
(A) zero error = + 0.95 mm (B) zero error = – 0.95 mm
(C) zero error = + 0.05 mm (D) zero error = – 0.05 mm

Experiment - 3

SIMPLE PENDULUM

SUMMARY

MCQ

1. Complete the following sentance.
Time period of oscillatin of a simple pendulum is dependent on _____
(A) Length of thread (B) initial phase
(C) amplitude (D) mass of bob

 

2. Complete the following seutence
In a damped oscillation of a pendulam _____
(A) the sum of potential energy and kinetic energy is conserved.
(B) mechanical energy is not conserved
(C) the kinetic energy is conserved
(D) the potential energy is conserved

 

 

 

Experiment - 4

METRE SCALE

SUMMARY

MCQ

1. When the moment of force is maximum, then what is the angle between force and position vector of the force ?
(A) 90^o (B) 0^o
(C) 30^o (D) 45^o

2. In the scale and wedge experiment, m situated at x from the wedge and M is situated at y from wedge at equillbrium.Now if m < M, then what is the relation between x and y ?
(A) x = y
(B) x < y
(C) x > y
(D) nothing can be said about - x and y unless values of m and M one know.

5. In the experiment of balancing moments, suppose the fulcrum is at the 60 cm mark, and a known mass of 2 kg is used on the longer arm. The greatest mass of m which can be balanced against 2 kg such that the minimum distance of either of the masses from the fulcrum is atleast 10 cm. (Neglect mass of metre scale.) What will be the value of m ?
(A) 12 kg (B) 4 kg
(C) 6 kg (D) 8 kg

6. The wedge is kept below the 60 cm mark on the meter scale. Known masses of 1 kg and 2 kg are hung at the 20 cm and 30 cm mark respectively. Where will a 4 kg mass be hung on the meter scale to balance it ? (Neglect mass of meter scale.)
(A) 85 cm (B) 90 cm
(C) 70 cm (D) 75 cm

7. When a metre scale is balanced above a wedge, 1 kg mass is hung at 10 cm mark and a 2 kg mass is hang at the 85 cm mark. To which mark on the meter scale, the fulcurm be shifted (Neglect mass of meter scale) to balance the scale ?
(A) 70 cm (B) 50 cm
(C) 60 cm (D) 65 cm

KEY NOTE
1(A) 2 (C) 3 (D) 4 (D)
5(A) 6 (A) 7 (C)

Experiment - 5

To determine Young's modulus of elasticity of the material of a metalic wire.
Wher e a wir e of length L is str atched by a for ce F. I ts cr oss section is A and it extends by l.

SUMMARY

KEY NOTE

1 (C) 2 (B) 3 (A) 4 (A)
5 (D) 6 (D) 7 (A) 8 (B)

4. By how much depth will the surface of a liquid be depressed in a glass tube of radius 0.2 mm if the angle of contact of the liquid is 135° and the surface tension is 0.547 Nm^-1 ? (Density of the liquid is kg m^-3)
(A) 3 cm (B) 4 cm
(C) 5 cm (D) 2 cm 

5. Complete the sentence If the height of a capillary is smaller than the height to which water should rise, then _____
(A) Water stops gets depressed in the capillary below the water surface.
(B) Water rises up to the height of the capillary and meniscus becomes less concave
(C) Water does not rise in such a capillary at all.
(D) Water states flowing out like a fountain. 

KEY NOTE

1 (C) 2 (A) 3 (B) 4( A) 5 (B)

2. A boat of area 10 m² floating on the surface of a river is made to move horizontaly with a speed of 2 ms^-1 by applying a tangential force. If the river is 1m deep and the water in contact with the bed is stationary, what is the tangential force needed to keep the boat moving ? (viscosity of water 0.01 poise)
(A) 0.04 N (B) 0.05 N
(C) 0.02 N (D) 0.03 N

3. A steeel ball of diameter 3 mm falls through glycerine and covers a distance of 25 cm in 10S. The specific gravity of steel and glycerine are 7.8 and 1.26 respectively. The viscosity of glycerine is about ____ pa^-s
(A) 1.3 (B) 1.5
(C) 0.8 (D) 1.0

KEY NOTE

1 (B) 2 (C) 3 (A) 4 (D)
5 (A) 6 (C) 7 (A) 8 (A)

5. A sphere, a cube and a thin circular plate are all made of the same material, have the same mass and are initially heated to a temperature of 2000C.Arrange then in the ascending order of rate of cooling.
(A) sphere, disc, cube (B) sphere, cube, disc
(C) cube, sphere, disc (D) disc, cube, sphere

KEY NOTE

1 (A) 2 (D) 3 (C) 4 (D) 5(B)

7. A hollow pipe of length 0.8 m is closed at one end. At its open end a 0.5 m long uniform string is vibrating in its second harmonic and it rosonates with the fundamentals frequency of the pipe if the tension in the wire is 50 N and the speed of sound is 320 ms^-1, what is the mass of the string.
(A) 20 g (B) 5 g
(C) 40g (D) 10 g

8. An air column in a pipe, which is closed at one end will be in resonance with a ribrating tuning fork of frequency 264 Hz, What is the length of the column if it is in cm ? (speed of sound in air = 330 m/s)
(A) 62.50 (B) 15.62
(C) 125 (D) 93.75

9. In a resonance tube experiment, the first resonance is obtained for 10 cm of air column and the second for 32 cm.The end correction for this apparatus is equal to ______
(A) 1.9 cm (B) 0.5 cm
(C) 2 cm (D) 1.0 cm

KEY NOTE

1 (B) 2 (B) 3 (C) 4 (C) 5 (A)
6 (C) 7 (D) 8 (D) 9 (D) 10 (A)

KEY NOTE

1 (B) 2 (B) 3 (C) 4 (A)
5 (C) 6 (B) 7 (A) 8 (B)
9 (B) 10 (D) 11(D)

Experiment - 13

Potentio meter :

SUMMARY

(i) Comparison of emf of two primary cells.
(ii) internal resistance of a cell.

MCQ

1. A 10 m wire potentiometer is connected to an accumulator of steady voltage. A 7.8 m length of it balances the emf of a cell on 'open-circuit'. When cell delivers current through a conductor of resistance 10 Ω it is balanced against 7.0 m of the same poleutomelic. What is the internal resistance of the cell ?
(A) 1.24Ω (B) 1.36Ω (C) 1.14Ω (D) 1Ω

2. A potentiometer is preferred over a voltmeter to measure the emf of a cell because.....
(A) The material of the potentiometer wire has a low temperature coefficient of resistance
(B) emf measured by potentiometer is more accurate because the cell is open-circuit.
(C) potetial gradients can be varied in a poteutiometer using a rheostat.
(D) Potentiometer is more sensitive than voltmeter.

KEY NOTE
1 (C) 2 (B) 3 (C) 4 (B) 5 (A)
6 (B) 7 (C) 8 (A) 9 (A) 

SUMMARY

Experiment - 16

Using the parallax method, plot of angle of deviation Vs angle of incidence for a triangular prism. Reflective index of the material of the prism,

SUMMARY

8. The velocity of light in glass whose refractive index with respect to air is 1.5 is 2x10⁸ m/s. In a certain liquid, the velocity of light is found to be 2.5x10⁸ m/s. What is the refractive index of the liquid with respect to air?
(A) 1.44 (B) 0.80
(C) 1.20 (D) 0.64

KEY NOTE
1 (A) 2 (D) 3 (C) 4 (C)

5 (D) 6 (C) 7 (B) 8 (C)

MCQ

1. In the zener diode, at VZ, the breakdown voltage ______
(A) a large change in voltage produces an insignificant change in the current.
(B) a large change in current produces an insignificant change in the voltage.
(C) a small change in current causes a small change in voltage.
(D) a small change in current can cause a large change in the voltage.

2. The zener voltage of a zener diode is kept at a desired value by ______
(A) adjusting the input voltage
(B) adjusting the input current
(C) by connecting an appropriate resistance in series
(D) changing the level of doping

3. The emission of electrons from the host atoms due to the high electric field is known as ____
(A) avalanche field emmission (B) breakdown field emission
(C) zener field emission (D) internal field emission

6. Zener diodes are used as
(A) amplifiers (B) voltage regulators
(C) oscillators (D) half-wave rectifiers

7. For the same density of impurity atoms, Zener voltage is _____
(A) same for both Ge and Si
(B) higher for Ge than for Si
(C) higher for silicon than for germanium
(D) none of the above

8. When p-n junction is reverse biased ______
(A) no current flows
(B) majority carriers move towards the junction
(C) minority carriers move towards the junction
(D) both majority and minority carriers move away from the junction

9. What constitutes the reverse current ?
(A) holes in both p and n type.
(B) free electrons in both p and n type
(C) free electrons in p-type and holes in n-type
(D) holes in p-type and free electrons in n-type.

10. Avalanche breakdown in a semiconductor diode happend when _____
(A) forward bias exceeds a certain value
(B) forward current exceeds a certain value
(C) reverse bias exceed a certain value
(D) the potential barrier is reduced to zero

KEY NOTE
1 (B) 2 (D) 3 (D) 4 (C) 5 (A)
6 (B) 7 (C) 8 (C) 9 (C) 10 (C)

Experiment - 21

To identify a diode, an LED, a transistor, an IC, a resistor and a capacitor from a mixed collection of such items.

SUMMARY

• For identification, appearance and working of each item will have to be considered.
• A diode is a two terminaldevice. It conducts when forward biased and does not conduct when reverse biased. It does not emit light while conducting.
• A LED (light emitting diode) is also a two terminal device. It also conducts when forward biased and does not conduct when reverse biased. It emits light while conducting.
• A transistor is a three terminal device. The terminals represent emitter (E), base (B) and collector (C).
• An IC (intergrated circuit) is a multi terminal device in form of a chip.

•  A resistor is a two terminal device. It conducts when either forward biased or reverse biased. (Infact there is no forward or reverse bias for a resistor). It conducts even when operated with A.C. voltage.
•  A capacitor is also a two terminal device. It does not conduct when either forward biased or reverse biased (Hence it does not conduct with D.C. voltage). However, it conducts with A.C. voltage.
•  Match column A and B type Questions
In the column A some name of electronic component given and in the column B number of its terminal match each other.

In the experiment identify adiode, an LED,a transistor, an IC, a resistor and a capacitor from a mixed collection of such items.When the switch on the baterry eliminator the movement of the multimeter polnter given in column A. and electronic componants name given in column B.

KEY NOTE

1 (A) 2 (C)