# Physics (Test 1)

## Tancet Anna University : Ece Electronics And Communication Engineering

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Physics
| Physical World | | Units and Measurements | | Motion in A Straight Line | | Motion in A Plane | | Laws of Motion | | Work Energy and Power | | System of Particles and Rotational Motion | | Gravitation | | Mechanical Properties of Solids | | Mechanical Properties of Fluids | | Thermal Properties of Matter | | Thermodynamics | | Kinetic Theory | | Oscillations | | Waves | | Electric Charges and Fields | | Electrostatic Potential and Capacitance | | Current Electricity | | Moving Charges and Magnetism | | Magnetism and Matter | | Electromagnetic Induction | | Alternating Current | | Electromagnetic Waves | | Ray Optics and Optical Instruments | | Wave Optics | | Dual Nature of Radiation and Matter | | Atoms | | Nuclei | | Electronic Devices | | Communication Systems | | UNIT I: Nature of Physical World and Measurement | | UNIT II: Kinematics | | UNIT III: Laws of motion | | UNIT IV: Work, Energy and Power | | UNIT V: Motion of System of Particles and Rigid Bodies | | Unit I: Electrostatics | | Unit II: Current Electricity | | Unit III: Magnetism and magnetic effects of electric current | | Unit IV: Electromagnetic Induction And Alternating Current | | Unit V: Electromagnetic waves |
Q.1
The dimension of 1/µ0ε0 is
A. [L T-1  ]
B. [L2T−2]
C. [L−1 T]
D. [L−2 T2]
Answer : Option B
Explaination / Solution:

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Q.2
Which of the following is an electromagnetic wave?
A. α - rays
B. β - rays
C. γ - rays
D. all of them
Answer : Option C
Explaination / Solution:
No Explaination.

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Q.3
A circular coil with a cross-sectional area of 4 cm2 has 10 turns. It is placed at the centre of a long solenoid that has 15 turns/cm and a cross-sectional area of 10 cm2. The axis of the coil coincides with the axis of the solenoid. What is their mutual inductance?
A. 7.54 µH
B. 8.54 µH
C. 9.54 µH
D. 10.54 µH
Answer : Option A
Explaination / Solution:

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Q.4
The magnetic field at the center O of the following current loop is

A.
B.
C.
D.
Answer : Option A
Explaination / Solution:

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Q.5

The BH curve for a ferromagnetic material is shown in the figure. The material is placed inside a long solenoid which contains 1000 turns/ cm. The current that should be passed in the solenonid to demagnetize the ferromagnet completely is

A. 1.00 m A (milli ampere)
B. 1.25 mA
C. 1.50 mA
D. 1.75 mA
Answer : Option B
Explaination / Solution:

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Q.6
Two wires of A and B with circular cross section made up of the same material with equal lengths. Suppose RA = 3 RB, then what is the ratio of radius of wire A to that of B?
A. 3
B. √3
C. 1/ √3
D. 1/3
Answer : Option C
Explaination / Solution:

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Q.7
Two identical point charges of magnitude –q are fixed as shown in the figure below. A third charge +q is placed midway between the two charges at the point P. Suppose this charge +q is displaced a small distance from the point P in the directions indicated by the arrows, in which direction(s) will +q be stable with respect to the displacement?

A. A1 and A2
B. B1 and B2
C. both directions
D. No stable
Answer : Option B
Explaination / Solution:

Hint: Since V=0 along equatorial line
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Q.8
Two points A and B are maintained at a potential of 7 V and -4 V respectively. The work done in moving 50 electrons from A to B is
A. 8.80 × 10-17 J
B. -8.80 × 10-17 J
C. 4.40 × 10-17 J
D. 5.80 × 10-17 J
Answer : Option A
Explaination / Solution:

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Q.9
A rigid body rotates with an angular momentum L. If its kinetic energy is halved, the angular momentum becomes,
A. L
B. L/2
C. 2L
D. L/ 2
Answer : Option D
Explaination / Solution:
No Explaination.

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Q.10
An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water of the jet. What is the rate at which kinetic energy is imparted to water ?.
A. ½ mv2
B. mv2
C. ½ mu2
D. mu2
Answer : Option A
Explaination / Solution:
No Explaination.

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