Assertion (A): Radio waves bend in a magnetic field.Reason (R): Radio waves are electromagnetic in nature.

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true, but (R) is not the correct explanation of (A)

Assertion (A): Radio waves bend in a magnetic field.<br>Reason (R): Radio waves are electromagnetic in nature.

An assertion and a reason are given below. Assertion: The phenomenon of nuclear fission generates great energy. Reason: The process in which a nucleus is broken into two parts is called nuclear fission. Choose the answer. A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion. B. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion. C. Both Assertion and Reason are false. D. Assertion is true but Reason is false.

A

B

D

C

B

D

C

If the bend of a bend test has to be gauged to its complete extent _________ of bend must be computed.

A

inner circumference

B

the inner minus outer circumference

C

outer circumference

D

inner radius

At the interface between two linear dielectrics (with dielectric constants $${{\varepsilon _1}}$$ and $${{\varepsilon _2}}$$), the electric field lines bend, as shown in the figure. Assume that there are no free charges at the interface. The ratio $$\frac{{{\varepsilon _1}}}{{{\varepsilon _2}}}$$ is
Electromagnetic Theory mcq question image

Electromagnetic Theory mcq question image

A

$$\frac{{\tan {\theta _1}}}{{\tan {\theta _2}}}$$

B

$$\frac{{\cos {\theta _1}}}{{\cos {\theta _2}}}$$

C

$$\frac{{\sin {\theta _1}}}{{\sin {\theta _2}}}$$

D

$$\frac{{\cot {\theta _1}}}{{\cot {\theta _2}}}$$

Consider a conducting loop of radius a and total loop resistance R placed in a region with a magnetic field B thereby enclosing a flux $${\phi _0}$$ . The loop is connected to an electronic circuit as shown, the capacitor being initially uncharged.
Electromagnetic Theory mcq question image

If the loop is pulled out of the region of the magnetic field at a constant speed u, the final output voltage V_out is independent of

A

$${\phi _0}$$

B

u

C

R

D

C

Two magnetic dipoles of magnitude m each are placed in a plane as shown below. The energy of interaction is given by
Electromagnetic Theory mcq question image

A

zero

B

$$\frac{{{\mu _0}}}{{4\pi }} \cdot \frac{{{m^2}}}{{{d^3}}}$$

C

$$\frac{{3{\mu _0}}}{{2\pi }} \cdot \frac{{{m^2}}}{{{d^3}}}$$

D

$$ - \frac{{3{\mu _0}}}{{8\pi }} \cdot \frac{{{m^2}}}{{{d^3}}}$$

A circular arc QTS is kept in an external magnetic field $${\overrightarrow {\bf{B}} _0}$$ as shown in figure. The arc carries a current $$l$$. The magnetic field is directed normal and into the page. The force acting on the arc is
Electromagnetic Theory mcq question image

A

$$2l{B_0}R{\bf{\hat k}}$$

B

$$l{B_0}R{\bf{\hat k}}$$

C

$$ - 2l{B_0}R{\bf{\hat k}}$$

D

$$ - l{B_0}R{\bf{\hat k}}$$

In the following question, the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct. 1. Earthquakes are the shaking and moving of the ground when energy is released in waves. P. These waves are similar to ocean waves, which move through water. Q. These waves are called seismic waves. R. Seismic waves, however, move through the ground. S. Earthquakes can also be caused by other natural events, such as landslides and volcanoes. 6. Manmade earthquakes happen because of nuclear testing and mining explosions.

A

RSQP

B

RPQS

C

QPSR

D

QPRS

Which of the following statements is/are correct? 1. Secondary waves are compressional waves that are longitudinal in nature. 2. Primary waves are shear waves that are transverse in nature.

A

1 only

B

2 only

C

Both 1 and 2

D

Neither 1 nor 2

The question below consists of a set of labeled sentences. Out of the four options given, select the most logical order of the sentences to form a coherent paragraph. P: Mobile phones use transmitting radio waves through a series of base stations where radio frequency waves are electromagnetic fields that cannot break chemical bonds or cause ionization in the human body. Q: While cell phones provide an efficient and easy way to communicate with friends, family, and co-workers, excessive use can take a toll on your health. R: The constant ringing, vibrating alerts, and reminders can put a cell phone user on the edge and increase stress level, generate negative emotions, increase chances of chronic pain. S: Don't gamble on your life, and learn about the reasons why increased cell phone use can have short-term and long-term effects on your health.

A

QPRS

B

QPSR

C

SRQP

D

PQRS

The wavelengths of which electromagnetic waves is between those of radio waves and infra-red waves?

A

Ultraviolet

B

X-Rays

C

Gamma rays

D

Microwaves

Assertion (A): Radio waves bend in a magnetic field.
Reason (R): Radio waves are electromagnetic in nature.

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