Search Previous Year Questions

The correct answer is Microwaves.

Key Points

• Microwaves are used for telecommunication.
• It modulates the mechanical waves emitted by our vocal cords. Great physicists such as Hertz, Tesla, Branly, and Marconi understood that using electromagnetic waves to convey information through the air was possible.
• Many types of EMF are used to convey information over a distance, the most common being radio waves, also called radio frequencies.
• This is a broad spectrum ranging from tens of kilohertz to 300 gigahertz.

Important Points

• Ultraviolet (UV) light has shorter wavelengths than visible light.
• The wavelength range is 100-400 nm.
• UV waves are invisible to the human eye, but some insects, such as bumblebees, can see them.
• This is similar to how a dog can hear the sound of a whistle just outside the hearing range of humans.
• These invisible rays are part of the energy that comes from the sun, which can burn the skin and cause skin cancer.
• It is widely used in industrial processes and in medical and dental practices for a variety of purposes, such as killing bacteria, creating fluorescent effects, curing inks and resins, phototherapy, and suntanning.
• X-rays have much higher energy and much shorter wavelengths than ultraviolet light.
• X-rays have very small wavelengths, between 0.01 to 10 nanometers.
• The use of x-rays is to check for fractures (broken bones), and chest x-rays can spot pneumonia. Mammograms use x-rays to look for breast cancer.
• Infrared waves have longer wavelengths than visible light and can pass through dense regions of gas and dust in space with less scattering and absorption.
• Its spectrum is around 700 nanometers, to 1 millimeter.
• The heat that we feel from sunlight, a fire, a radiator, or a warm sidewalk is infrared.

The correct answer is Acrophobia.

• Acrophobia is described as an intense fear of heights that can cause significant anxiety and panic.

Important Points

• Anglophobia describes dislike or fear or hatred towards England or English people.
• Ergophobia is characterized by an irrational and excessive fear of work.
• Agoraphobia is a fear of places and situations that might cause panic, helplessness, or embarrassment.

Additional Information

• Some common phobias list:

Given:

The ratio of present ages of three persons are in the ratio 4 : 7 : 9

8 years ago sum of their ages were = 56

Calculation:

Let us take the ratio of ages be 4x, 7x, 9x respectively

Ages of the person before 8 years = (4x - 8), (7x - 8), (9x - 8)

According to the question

⇒ (4x - 8) + (7x - 8) + (9x - 8) = 56 

⇒ 20x - 24 = 56

⇒ 20x = 80  

⇒ x = 4

Substituting the values in ratio

⇒ 4 × 4 : 7 × 4 : 9 × 4 = 16 : 28 : 36

∴ The present ages of 3 persons are 16, 28, 36

Given:

A can do a work = 10 days

B can do a work = 12 days

C can do a work = 15 days

Formula Used: 

In the LCM method 

Number of days = total work/efficiency

Calculation:

LCM of (10, 12, 15) = 60 units

⇒The efficiency of A = 6 units

⇒The efficiency of B = 5 units

⇒The efficiency of C = 4 units

First 2 days (A + B + C) = (6+5+4) × 2 ⇒ 30units 

Last 4 days work done by B alone = 5 × 4 = 20 units

Remaining Work = 60 - (30 + 20) ⇒ 10 units

The remaining work is completed by B and C = 10/(5+4) ⇒ 10/9 days

So total number of days = 2 + 4 + 10/9 ⇒ 64/9 days 

 ∴ Work was finished in 64/9 days

The correct answer is Weight lifting.

Key Points

• Mirabai Chanu won India’s first gold medal in the Commonwealth Games.
• The 23-year-old won her first medal in the 2014 Commonwealth Games, the silver in the women’s 48-kg weight class.
• She got the Rajiv Gandhi Khel Ratna award in 2018.
• She clinched a gold medal at the EGAT Cup in Thailand, making a strong comeback from the lower back injury that kept her out of action for more than half of 2018.

Given:

Length of the train = 100 metre 

Speed of Train = 30 km/hr 

Formula Used:

Distance = Speed × Time

Calculation:

Let us convert the speed from km/hr to m/s 

30 × 5/18 = 25/3 m/s 

If a train crosses a man then the distance travelled by train will be equal to the length of the train

100 = 25/3 × time

⇒ 300/25 = 12 sec

∴ The time taken by a 100-metre long train to cross a man will be 12 sec

Given:

A Time take by a tap to fill a tank = 6 hours

Work is done by the tap = 1/2

Similar three taps are opened with the same efficiency

Formula Used:

In the LCM method 

Number of days = Total work\efficiency

Calculation:

Lcm for 6 = 6 units

⇒Total work = 6 units

⇒The efficiency of 1^st tap = 1 

⇒Half work is done = 3 units

Time taken by a Tap to fill half tank = 3/1 ⇒ 3hours

Remaining work = 6 - 3 ⇒ 3 units 

3 extra taps with similar efficiency are opened

⇒The total efficiency of all 4 taps = 4

Number of hours to fill = remaining work/Total efficiency of all taps

Time take by all 4 taps = (3/4) × 60⇒ 45 minutes 

∴ The total time taken by all taps to fill a tank = 3 hours and 45 minutes

Alternate method:

A Time take by a tap to fill a tank = 6 hours

Time taken by tap to fill a tank in 1 hour = 1/6

Let us take the Total work to be  1unit

time taken by the tap to fill half tank = 6 × 1/2 ⇒ 3 hours      ----(ii)

Work remaining = 1/2 unit

similar three taps are opened 

Time take to complete the remaining work by the four taps be x

4 × (1/6)x = 1/2  

x = 3/4 hour ⇒ 45 minutes      ----(ii)

Adding (i) and (ii) we get

∴ Total time taken by all taps to fill a tank is 3 hour and 45 minutes

The correct answer is Rural development.

Important Points

• "NABARD" means 'National Bank for Agriculture and Rural Development'.
• It is not a wholly own subsidiary of RBI now because RBI sold 99% of its stake to GOI.
• Its headquarter is in Mumbai, India.
• The Chairman of NABARD is Dr. Harsh Kumar Bhanwala.
• NABARD was founded on 12 July 1982.
• The main role of NABARD is to provide and manage credit flow for the development of the rural area.
• National Bank for Agriculture and Rural Development (NABARD) was approved by the Parliament through Act 61 of 1981.
• It is the development Bank of the Nation for Fostering Rural Prosperity.
• It promotes sustainable and equitable agriculture and rural development through participative financial and non-financial interventions, innovations, technology and institutional development for securing prosperity.

The correct answer is Rs. 1.

Key Points

• The Government of India prints One Rupee currency notes.
• The Reserve Bank of India does not issue one rupee like other Indian currency notes (Rs. 100, Rs. 500, Rs. 2000).
• The size of this one rupee currency note will be rectangular 9.7 x 6.3 cms.
• It will be 110 microns thick while its weight will be 90 GSM (Grams per Square Meter).
• The observe side of the One Rupee Currency note will contain ‘Bharat Sarkar’ at the top in Hindi while ‘Government of India’ will be written in English below.
• The language panel on Indian rupee banknotes display the denomination of the note in 15 of the 22 official languages of India .
• An image of the oil exploration platform ‘Sagar Samrat’ will also be there.

The correct answer is 6 months.

Key Points

• President's removal from office is to be under the procedure prescribed in Article 61 of the Constitution.
• He may, by writing under his hand addressed to the Vice-President, resign his office.
• The Vice-President is ex-officio Chairman of the Rajya Sabha and acts as President when the latter is unable to discharge his functions due to absence, illness, or any other cause, or till the election of a new President (to be held within 6 months when a vacancy is caused by death, resignation or removal or otherwise of President).
• When the President dies in office and Vice President takes over as President, he can continue serving as the President for a maximum of 6 months within which a new President shall be elected.

 

Important Points

• The Vice-President is elected by an electoral college consisting of members of both Houses of Parliament.
• A person cannot be elected as Vice-President unless he -

1. He/ She is a citizen of India.
2. Has completed the age of 35 years.
3. He/ She is qualified for election as a member of the Council of States (Rajya Sabha).