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Q:

A man went downstream for 28 km in a motor boat and immediately returned. It took the man twice as long to make the return trip. If the speed of the river flow were twice as high, the trip downstream and back would take 672 minutes. Find the speed of the boat in still water and the speed of the river flow.

A) 12 km/hr, 3 km/hr	B) 9 km/hr, 3 km/hr
C) 8 km/hr, 2 km/hr	D) 9 km/hr, 6 km/hr

Answer & Explanation Answer: B) 9 km/hr, 3 km/hr

Explanation:

Let the speed of the boat = p kmph

Let the speed of the river flow = q kmph

From the given data,

$2 x \frac{28}{p + q} = \frac{28}{p - q}$

=> 56p - 56q -28p - 28q = 0

=> 28p = 84q

=> p = 3q.

Now, given that if

$\frac{28}{3 q + 2 q} + \frac{28}{3 q - 2 q} = \frac{672}{60} = > \frac{28}{5 q} + \frac{28}{q} = \frac{672}{60} = > q = 3 kmph = > x = 3 q = 9 kmph$

Hence, the speed of the boat = p kmph = 9 kmph and the speed of the river flow = q kmph = 3 kmph.

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Q:

In which layer is the pressure the highest?

A) Ionosphere	B) Stratosphere
C) Troposphere	D) Inner core

Answer & Explanation Answer: D) Inner core

Explanation:

"Pressure" is the ratio of mass to area. So, for any given area, the one with more mass pressing on it will experience a higher pressure.

As you go more deeply into the atmosphere OR earth itself, you are putting more and more mass over you. For the same unit area therefore, the pressure, (mass/area) increases.

Hence, the lowest layer will always have the highest pressure i.e, inner core.

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Q:

What frequency range is the high frequency band?

A) 3 kHz	B) 3 to 30 MHz
C) 30 to 300 MHz	D) 10 GHz

Answer & Explanation Answer: B) 3 to 30 MHz

Explanation:

The HF band is based on frequencies 3 to 30 Mhz. AM radio stations are in the HF band but normally are stated in kilohertz.

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Q:

Which of the following has the highest frequency?

A) Cosmic rays	B) X-rays
C) Radio waves	D) Microwaves

Answer & Explanation Answer: A) Cosmic rays

Explanation:

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Q:

Microwave communication uses high-frequency.

A) TRUE

B) FALSE

Answer & Explanation Answer: A) TRUE

Explanation:

Microwaves are high-frequency signals in the 300 MHz to 300 GHz range. This is in contrast to radio signals, which are typically broadcast in all directions. Radio signals operate in the 3 Hz to 300 MHz range.

Microwave signals are used for both satellite and ground-based communications.

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Subject: Physics
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Q:

Which state has the highest number of 55770 fully covered tribal habitations with the safe drinking water in the country followed by Odisha and Jharkhand?

A) Tamilnadu	B) Kerala
C) Manipur	D) Madhya Pradesh

Answer & Explanation Answer: D) Madhya Pradesh

Explanation:

Madhya Pradesh has the highest number of 55770 fully covered tribal habitations with the safe drinking water in the country followed by Odisha and Jharkhand.

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Filed Under: Indian Geography
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Q:

Highest Bajra producing state in India?

A) Rajasthan	B) Gujarat
C) Uttar Pradesh	D) Haryana

Answer & Explanation Answer: A) Rajasthan

Explanation:

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Q:

Highest sugarcane producing state in India?

A) Maharashtra	B) Uttar Pradesh
C) Gujarat	D) Uttarakhand

Answer & Explanation Answer: B) Uttar Pradesh

Explanation:

Agriculture is the occupation of a majority of the Indian population. More than 65% of India's land area is under agriculture.

Sugarcane is one of the most popular multipurpose crops in India and no part of the sugarcane goes waste.

Uttar Pradesh is the highest sugarcane producing state in India followed by Maharashtra.

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