Physics | NEET Entrance Exam | Under Graduate Entrance Exams Online Objective Test

Under Graduate Entrance Exams NEET Entrance Exam # Physics Ray Optics and Optical Instruments Prepare / Learn

Q1. The layered lens is made of two kinds of glass. A point source of light is placed on its principal axis. If the reflections from the boundaries between layers are ignored, the lens will form

A. two images

B. only one image

C. no image at all

D. infinite images

Answer : Option A
Explaination / Solution:
No Explaination.

Under Graduate Entrance Exams NEET Entrance Exam # Physics Nuclei Prepare / Learn

Q2. Nuclear fusion is possible

A. only between heavy nuclei

B. between both light and heavy nuclei

C. only between light nuclei

D. only between nuclei which are stable against β -decay

Answer : Option C
Explaination / Solution:
No Explaination.

Under Graduate Entrance Exams NEET Entrance Exam # Physics Thermal Properties of Matter Prepare / Learn

Q3. Two absolut scales A and B have triple points of water defined to be 200 A and 350 B. What is the relation betweene

T_{A}

and

T_{B}

T_{A}

= (5/9)

T_{B}

T_{A}

= (3/7)

T_{B}

T_{A}

= (2/7)

T_{B}

T_{A}

= (4/7)

T_{B}

Answer : Option D
Explaination / Solution:

for any temperature scale

$\begin{aligned} \frac{X}{X_{T r}} = c o n s t . \\ \frac{T_{A}}{200} = \frac{T_{B}}{350} \\ T_{A} = \frac{4}{7} T_{B} \end{aligned}$

Under Graduate Entrance Exams NEET Entrance Exam # Physics Units and Measurements Prepare / Learn

Q4.

The photograph of a house occupies an area of 1.75 $c m^{2}$ on a 35 mm slide. The slide is projected on to a screen, and the area of the house on the screen is 1.55 $m^{2}$ . What is the linear magnification of the projector-screen arrangement?

A. 94.1

B. 88.4

C. 84.1

D. 90.2

Answer : Option A
Explaination / Solution:

Area of the house on the slide = 1.75 cm2

Area of the image of the house formed on the screen = 1.55 m2 = 1.55 × 104 cm2

Arial magnification am = $\frac{A r e a o f i m a g e}{a r e a o f o b j e c t}$

= $\frac{1.55 \times 10^{4}}{1.75}$

Linear magnification = $\sqrt{a_{m}} = \sqrt{8857}$

= 94.1

Under Graduate Entrance Exams NEET Entrance Exam # Physics Alternating Current Prepare / Learn

Q5. The voltage across the terminals of an ac power supply varies with time according to Vcosωt. The voltage amplitude is V = 45.0 V. Root-mean-square potential difference is

A. 37.8 V

B. 35.8 V

C. 33.8 V

D. 31.8 V

Answer : Option D
Explaination / Solution:

maximum voltage across the terminals V = 45 volt

Root-mean-square potential difference

$V_{r m s} = \frac{V}{\sqrt{2}} = \frac{45}{\sqrt{2}} = 31.8 v o l t$

Under Graduate Entrance Exams NEET Entrance Exam # Physics Current Electricity Prepare / Learn

Q6. The wire of the potentiometer has resistance 4 ohms and length 1 m. It is connected to a cell of e.m.f. 2 volts and internal resistance 1 ohm. The p.d. across the potentiometer wire is:

A. 1.2 V

B. 1.6 V

C. 0.8 V

D. 2.0 V

Answer : Option B
Explaination / Solution:

If the battery has an e.m.f E, the resitance of the potentiometer is R and internal resistance of the battery is r, then the current I flowing in the potentiometer wire is given as,

$\begin{array}{l} I = \frac{E}{(R + r)} \\ I = \frac{2}{(4 + 1)} \\ I = 0.4 A \end{array}$

The potential difference V across the potentiometer is

$\begin{array}{l} V = I \times R \\ \Rightarrow V = 0.4 \times 4 \\ V = 1.6 V \end{array}$

Under Graduate Entrance Exams NEET Entrance Exam # Physics Oscillations Prepare / Learn

Q7. A rubber ball with water, having a small hole in its bottom is used as the bob of a simple pendulum. The time-period of such a pendulum:

A. Is a constant

B. First increases and then decreases finally having same value as at the beginning

C. Increases with time

D. Decreases with time

Answer : Option B
Explaination / Solution:
No Explaination.

Under Graduate Entrance Exams NEET Entrance Exam # Physics Moving Charges and Magnetism Prepare / Learn

Q8. A magnetic needle lying parallel to a magnetic field requires W units of work to turn it, through 600. The torque needed to maintain the needle in this position will be

A. 2 W

B. (3√W)

(3√W)2

Answer : Option B
Explaination / Solution:

the work done to turn a needle through an angle θ is

W = m B \cos θ

The torque needed to maintain

τ = m B \sin θ

\frac{τ}{W} = \tan θ

τ = W \tan θ = W \tan 60 = \sqrt{3} W

Under Graduate Entrance Exams NEET Entrance Exam # Physics Wave Optics Prepare / Learn

Q9. A light source emits visible light of two wavelengths: λ = 430 nm and λ' = 510 nm. The source is used in a double-slit interference experiment in which L = 1.5 m and d = 0.025 mm. separation distance between the third order bright fringes. is

A. 1.8 cm

B. 1.4 cm

C. 1.6 cm

D. 1.7 cm

Answer : Option B
Explaination / Solution:
No Explaination.

Under Graduate Entrance Exams NEET Entrance Exam # Physics Magnetism and Matter Prepare / Learn

Q10. which of the following features of atomic structure determine whether an element is diamagnetic or paramagnetic

A. atomic weight

B. principal quantum number

C. number of electrons

D. orbital angular momentum ,spin angular momentum

Answer : Option D
Explaination / Solution:
No Explaination.

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