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Q:

In total internal reflection, the light travel from

A) rarer to denser medium and it occurs with no loss of intensity	B) denser to rarer medium and it occurs with no loss of intensity
C) rarer to denser medium and it occurs with loss of intensity	D) denser to rarer medium and it occurs with loss of intensity

Answer & Explanation Answer: B) denser to rarer medium and it occurs with no loss of intensity

Explanation:

According to wave theories, for Total internal reflection tohappen: Light must travel from denser medium to rarer medium. Angle of incidence should be greater than critical angle. As in case of TIR, the image is perfectly clear, it implies that there has been no loss of intensity.

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Filed Under: Physics
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Q:

Two men standing on same side of a pillar 75 metre high, observe the angles of elevation of the top of the pillar to be 30° and 60° respectively the distance between two men is

A) 100 3m	B) 100m
C) 753m	D) 253m

Answer & Explanation Answer: A) 100 3m

Explanation:

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Filed Under: Height and Distance
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Q:

If $3 \sin θ + 4 \cos θ = 5 (0 < θ < 90 °)$ then the value of $\sin θ$ is

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

Answer & Explanation Answer: C) 3/5

Explanation:

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Filed Under: Simplification
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Q:

A, B and C are three points on a circle with centre O. The tangent at C meets BA produced at T. If ∠ATC = 30° and ∠ACT = 48°,then what is the value of ∠AOB ?

A) 78°	B) 96°
C) 102°	D) 108°

Answer & Explanation Answer: D) 108°

Explanation:

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Filed Under: Simplification
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Q:

If $\frac{a}{b} + \frac{b}{a} = 1,$ then the value of $a^{3} + b^{3}$ is

A) 1	B) 0
C) -1	D) 2

Answer & Explanation Answer: B) 0

Explanation:

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Filed Under: Simplification
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Q:

Which one of the following is not a tributary of the river Ganga?

A) Son	B) Mahananda
C) Teesta	D) Sharada

Answer & Explanation Answer: C) Teesta

Explanation:

Tributaries -

left:

Ramganga, Gomti, Karnali, Gandaki, Koshi, Mahananda

-

right:

Yamuna, Tamsa, Son, Punpun, Tons, Hindon, Kunta, Gir, Rishiganga, Hanuman Ganga, Sasur Khaderi

Sharda:

flows southeast another 100 km (62 mi) in Uttar Pradesh to join the Ghaghra (Karnali) as a right - bank tributary. Teesta is a tributary of Jamuna river.

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Filed Under: General Awareness
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Q:

If $a^{2} + b^{2} + c^{2} = 14$ and $a + b + c = 6$ , then the value of $(a b + b c + c a)$ is,

A) 11	B) 12
C) 13	D) 14

Answer & Explanation Answer: A) 11

Explanation:

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Q:

Which of the following statements concerning atmosphere of the Earth are correct?

1. In stratosphere, temperature increases with altitude.

2. In mesosphere, temperature decreases with altitude.

3. The lowest temperature of the atmosphere is recorded in the upper part of mesosphere.

4. Tropopause is an isothermal zone.

Select the correct answer using the code given below.

A) 1 and 2 only	B) 1, 2 and 3 only
C) 3 and 4 only	D) 1, 2, 3 and 4

Answer & Explanation Answer: D) 1, 2, 3 and 4

Explanation:

In troposphere and mesosphere, temperature declines with increasing altitude. In stratosphere and thermosphere, temperature increases with increasing altitude.The coldest temperatures in Earth’s atmosphere occur at the top of mesosphere, the Mesopause, especially in the summer near the pole.Transitional layers of atmosphere include tropopause, stratopause, and mesopause. These layers are relatively thin and are located between major layers of atmosphere. These have contrasting thermal properties. Hence, in these layers there is no change in temperature with change in altitude.

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Filed Under: General Science
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