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

Under Graduate Entrance Exams NEET Entrance Exam # Physics System of Particles and Rotational Motion Prepare / Learn

Q1. When a mass is rotating in a plane about a fixed point, its angular momentum is directed along

A. the radius

B. the axis of rotation

C. A line at an angle of 45o to the plane of rotation

D. The tangent to the orbit

Answer : Option B
Explaination / Solution:

$\vec{L} = \vec{r} \times \vec{p} = m (\vec{r} \times \vec{v})$ cular to both

$\vec{r}$ and $\vec{v}$ that is along the axis of rotation according to right hand screw rule.

Under Graduate Entrance Exams NEET Entrance Exam # Physics Mechanical Properties of Fluids Prepare / Learn

Q2. A man in a lift is holding a can filled with water but having a hole in its bottom. When will the drainage of water be maximum?

A. when the lift goes down with uniform velocity

B. When the lift is going up with acceleration

C. when the lift is going down with acceleration

D. When the lift is stationary

Answer : Option B
Explaination / Solution:
No Explaination.

Under Graduate Entrance Exams NEET Entrance Exam # Physics Kinetic Theory Prepare / Learn

Q3.

A tank used for filling helium balloons has a volume of 0.300 $m^{3}$ and contains 2.00 mol of helium gas at 20.0 $^{\circ} C$ . Assuming that the helium behaves like an ideal gas, What is the average kinetic energy per molecule?

A. 6.28

\times

1 0^{- 21}

B. 6.07

\times

1 0^{- 21}

C. 6.95

\times

1 0^{- 21}

D. 5.53

\times

1 0^{- 21}

Answer : Option B
Explaination / Solution:

E=32kT=32×1.38×10−23×293=6.07×10−21J

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

Q4. The magnifying power of the telescope can be increased by

A. increasing the focal length of eyepiece

B. fitting eye-piece of high power

C. increasing the distance of an object

D. fitting eye-piece of low power

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q5. A radioactive substance has a half life of four months. Three fourths of the substance will decay in

A. 4 months

B. 8 months

C. 12 months

D. 3 months

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q6. Find the wrong statement about specific heat of a material

A. is extensive property

B. Heat capacity per unit mass

C. Constant for a material

D. Has units as J/kg-K.

Answer : Option A
Explaination / Solution:

extensive properties (i.e. mass) are dependent upon the amound of a substance, while intensive properties (i.e. density) are independent of quantity.

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

Q7. Approximately How many km

h^{- 2}

is 3 m

s^{- 2}

A. 3.9

\times

1 0^{3}

B. 3.9

\times

1 0^{3}

C. 3.5

\times

1 0^{4}

D. 3.6

\times

1 0^{4}

Answer : Option B
Explaination / Solution:

1 km h-2 = $\frac{1000 m}{3600 \times 3600 s^{2}} = \frac{1}{360 \times 36} m s^{- 2}$

=> $1 m s^{- 2} = 360 \times 36 k m h^{- 2}$

=> $3 m s^{- 2} = 3 \times 360 \times 36 k m h^{- 2}$

=> $3 m s^{- 2} = 38880 k m h^{- 2}$

$=> 3 m s^{- 2} \approx 3.9 \times 10^{4} k m h^{- 2}$

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

Q8. A 200 ohm resistor is connected in series with a 5μF capacitor. The voltage across the resistor is VR = (1.20 V) cos(2500 rad/s)t . Capacitive reactance is

A. 80 Ω

B. 60 Ω

C. 90 Ω

D. 70 Ω

Answer : Option A
Explaination / Solution:

VR = (1.20 V) cos(2500 rad/s)t

ω=2500rad/s

C=5μF=5×10−6F

Capacitive reactance

XC=1ωC=12500×5×10−6=80Ω

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

Q9. A milliammeter of range 10 mA and resistance 9 ohms is joined in a circuit as shown. The device gives full-scale deflection for current I when A and B are used as its terminals, i.e., current enters at A and leaves at B (C is left isolated). The value of total current I is

A. 1.1 A

B. 100 mA

C. 900 mA

D. 1 A

Answer : Option D
Explaination / Solution:

Thee above circuit can be redrawn as:

Total resistance in the arm EF ( milliammeter and the 0.9Ω resistor)= 9+0.9=9.9Ω.

Since the milliammeter gives full scale deflection when A and B are used as its terminals, the current in the arm EF is 10 mA. The potential difference across the arm is

VEF = Ig* R = 10(10^ - 3) * 9.9 = 0.099V.

The potential difference across AB= potential diff across the 0.1Ω resistor= VEF = 0.099 V.

The current through the 0.1Ω resistor

$\begin{array}{l} I_{0.1} = \frac{V_{E F}}{0.1} = \frac{0.099}{0.1} \\ I_{0.1} = 0.99 A \end{array}$

The total current I is the sum of I0.1 and Ig

= Ig + I0.1 = 0.01 + 0.99 = 1A.

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

Q10. A simple spring has length l and force constant K. It is cut into two springs of lengths

l_{1}

and

l_{2}

such that

l_{1}

=n.

l_{2}

(where n is an integer), the force constant of the spring of length

l_{2}

A. K (1 +n)

B. K/n (1+n)

C. K/(n +1)

D. K/(n +1)

Answer : Option C
Explaination / Solution:
No Explaination.

Physics - Online Test

Physics | Online Objective Test | Start Test

Prepare Before Start Test | Learn

UPSC Civil services Entrance exams | Online Test

GATE Exam | Online Test

Under Graduate Entrance Exams | Online Test

Problem Solving and Reasoning | Online Test

CAT Entrance Exams | Online Test

CLAT LAW Entrance exams | Online Test

Banking Entrance exams | Online Test

UGC NET Entrance exams | Online Test

TANCET Anna University | Online Test

TN State Board | Online Test