Search Previous Year Questions

The correct answer is 'will have jogged.'

 

Key Points

• The future perfect tense refers to a completed action in the future.
• When we use this tense we are projecting ourselves forward into the future and looking back at an action that will be completed sometime later than now.
• Structure of sentence in the Future Perfect Tense:
• Subject + will have + past participle of the main verb + Object.
• Example: He will have arrived.
• Thus, the correct answer is Option 1.

Correct sentence: She will have jogged two miles before reaching the post office.

Hinglish

• Future perfect tense ​​भविष्य में एक पूर्ण क्रिया को संदर्भित करता है।
• जब हम इस काल का उपयोग करते हैं तो हम स्वयं को भविष्य में आगे की ओर प्रक्षेपित कर रहे होते हैं और पीछे मुड़कर एक ऐसी क्रिया की ओर देख रहे होते हैं जो अब से कुछ समय बाद पूरी होगी।
• Future perfect tense ​​में वाक्य की संरचना:
• Subject + will have + past participle of the main verb + Object.
• उदाहरण : He will have arrived.
• इस प्रकार, सही उत्तर विकल्प 1 है।

The correct answer is Asiatic buffalo.

Key Points

• International Union for Conservation of Nature:
• IUCN is a membership Union uniquely composed of both government and civil society organizations.
• Created in 1948, it is the global authority on the status of the natural world and the measures needed to safeguard it.
• Julian Huxley is the founder of the International Union for Conservation of Nature.
• It is headquartered in Switzerland.
• The IUCN Red List of Threatened Species is the world's most comprehensive inventory of the global conservation status of plant and animal species.
• It uses a set of quantitative criteria to evaluate the extinction risk of species. These criteria are relevant to most species and all regions of the world.
• The IUCN Red List Categories define the extinction risk of species assessed. 
• Nine categories extend from NE (Not Evaluated) to EX (Extinct). Critically Endangered (CR), Endangered (EN), and Vulnerable (VU) species are considered to be threatened with extinction.
• It is recognized as the most authoritative guide to the status of biological diversity.
• The first international red data books were published in 1966.
• ​International Union for Conservation of Nature is founded on 5^th October 1948.
• Asiatic buffalo​
• The Asian buffalo, also known as the wild Asian buffalo and the Asiatic buffalo.
• It is a giant bovine that is indigenous to Southeast Asia and the Indian subcontinent.
• Asia's tropical and subtropical jungles are home to water buffalo.
• Since they spend most of their time in the water, their comment is perfect.

Additional Information

• Lion-tailed macaque  

• The Lion-tailed macaque (Macaca silenus) is recognized as endangered species in India.

• It is endemic to the Western Ghats of South India.

• The hair of the lion-tailed macaque is black.

• Blue sheep

• ​Blue sheep is also called Bhara.

• Despite their name, blue sheep are neither blue nor sheep.

• It's scientific name is Pseudois nayaur.

• Gangetic Dolphin:

• The Gangetic river dolphins can only live in freshwater, are blind and catch their prey in a unique manner, using ultrasonic sound waves.

• They are distributed across seven states in India: Assam, Uttar Pradesh, Madhya Pradesh, Rajasthan, Bihar, Jharkhand and West Bengal.

• Categorized as ‘Endangered’ on the International Union for the Conservation of Nature’s (IUCN) Red List.

Shortcut Trick

Effective rate of interest for 2 years at 10% compounded annually = 10 + 10 + (10 × 10) ÷ 100 = 21%.

Total Amount = Principal + Interest = 100% + 21% = 121% of the Principal.

⇒ Amount = 121% × 9,000 = 1.21 × 9,000

⇒ Amount = ₹10,890.

∴ The correct answer is ₹10,890.

Alternate Method

Given:

Principal (P) = ₹9,000

Rate of interest (R) = 10% per annum

Time (n) = 2 years

Formula Used:

Amount (A) = P(1 + R ÷ 100)ⁿ

Calculations:

⇒ A = 9000 × (1 + 10 ÷ 100)²

⇒ A = 9000 × (1 + 0.1)²

⇒ A = 9000 × (1.1)²

⇒ A = 9000 × 1.21

⇒ A = ₹10,890

∴ The correct answer is ₹10,890.

Additional Information

Compound Interest (CI) Formula

CI = Amount − Principal = P[(1 + R ÷ 100)ⁿ − 1].

Effective Percentage Rate

For two successive growth rates of x% and y%, the total effective rate is [x + y + (x × y) ÷ 100]%.

Difference between CI and SI

The difference between Compound Interest and Simple Interest for 2 years is given by P(R ÷ 100)².

सही विकल्प है - कर्मधारय।

• 'कृष्णसर्प' पद में कर्मधारय समास है।

Key Points 

• 'कृष्णसर्प' का समास विग्रह 'कृष्ण है जो सर्प।' होगा।
• यहाँ सर्प विशेष्य है और कृष्ण विशेषण है।
• जिस समास में प्रथम पद विशेषण या उपमान होता है तथा द्वितीय पद विशेष्य या उपमेय होता है, अर्थात विशेषण–विशेष्य तथा उपमान-उपमेय का सम्बन्ध रहता है उसे कर्मधारय समास कहते हैं।

​ Additional Information

• समास - दो या दो से अधिक शब्द से बने हुए नए शब्द को समास कहा जाता है।
• समास के 6 भेद होते है-

Explanation:

Diffraction of light cannot convert unpolarized light into polarized light.

Polarization is defined as a phenomenon caused due to the wave nature of electromagnetic radiation.

• Sunlight travels through the vacuum to reach the Earth, which is an example of an electromagnetic wave.
• These waves are called electromagnetic waves because they form when an electric field that interacts with a magnetic field.
• There are two types of waves that are transverse waves, and longitudinal waves.

Diffraction of light is the phenomenon of bending of light from the sharp corners of a slit or obstacle and spreading into the region of geometrical shadow.

• Diffraction can occur only when the wavelength of light is comparable to the size of the obstacle or width of the slit.
• Diffraction is of two types:

1. Fresnel Diffraction - It is the type of diffraction which occurs when the light source lies at a finite distance from the slit.
2. Fraunhofer Diffraction - It is the type of diffraction which occurs when a plane wavefront is incident on the slit and the wavefront emerging from the slit is also plane.

Additional Information 

Scattering of light: 

The incident in which light rays get deviated from its path when it strikes an obstacle like dust, water vapours, or gas molecules, etc.

Rayleigh's law of scattering: According to Rayleigh's law of scattering, the intensity of light of wavelength λ present in the scattered light is inversely proportional to the fourth power of λ, provided the size of the scattering particles is much smaller than λ. Mathematically,

$I \propto \frac{1}{\lambda }$

Thus the scattered intensity is maximum for shorter wavelength.

Scattering of InfraRed light is less than visible light.

Reflection: 

The phenomena in which light ray is sent back into the same medium from which it is coming, on interaction with boundary, is called reflection

Laws of reflection:

The angle of incidence (θ i ) = Angle o  f reflection (θ r )

The incident ray, the reflected ray, and normal to the surface of incidence always lies in the same plane.

   

Double refraction is an optical property in which a single ray of unpolarized light entering an anisotropic medium is split into two rays, each traveling in a different direction.

Bleaching powder by its nature is an Oxidising agent.

• Stable bleaching powder is widely used as a disinfectant in water purification, as well as in the textile and pulp and paper industries.
• "Bleaching powder" is made by the action of chloride gas on calcium hydroxide.
• The reaction being essentially:
• 2Ca (OH)₂ + 2Cl₂ → Ca(OCl)₂ + CaCl₂ + 2H₂O.
• In the production of bleaching powder, slaked lime spread on the floors of large rectangular chambers of lead or concrete is exposed to chlorine gas.
• Bleaching powder, a solid combination of chlorine and slaked lime, was introduced in 1799 by Scottish chemist Charles Tennant.

The correct answer is 'Sullen'.

Key Points

• Morose means 'bad-tempered, and not saying much to other people (बुरे स्वभाव वाला, और दूसरे लोगों से ज्यादा कुछ नहीं कहना; चिड़चिड़ा, असौम्‍य और बात को अपने तक सीमित रखने वाला)'.
• ​Example: Week-long rain leaves crops damaged in Divar making farmers morose.
• Marked option 'Sullen' means 'looking bad-tempered and not wanting to speak to people (चिड़चिड़ा और उदासी भरा लोगों से बोलने का अनिच्‍छुक; खिन्‍न)'.
• Example: Kashmir to have a silent and sullen Eid after weeks of strife and violence.
• It is clear that Morose and 'Sullen' are nearly same in meaning.

Therefore, the correct answer is option 2.

Additional Information

• Communicative means willing and able to talk and share ideas, etc. (बातचीत या विचारों के आदान-प्रदान का इच्‍छुक व इसमें सक्षम).
• Cheerful means feeling or showing happiness (खुशी महसूस करना या दिखाना).
• Happy means feeling or showing pleasure; pleased (आनंद का अनुभव करने या उसे व्‍यक्त करने वाला; प्रसन्‍न, प्रफुल्‍ल).

The correct answer is less.

Key Points

• In normal conditions, the number of WBC in comparison to RBCs in the blood is less.
• The ratio of Red Blood Cells to White Blood Cells in the human body is 600:1.
• The primary function of red blood cells is to transport oxygen to body cells.
• White blood cells provide an immune system that defends the body against infectious diseases and foreign materials.
• The WBC is in the range of 4500–11000 per microliter of blood while RBC is in the range of 4.7–6.1 million cells per microliter.

Additional Information

• White blood cells, also called leukocytes make up approximately one percent by volume of the cells in the blood.
• They are primarily involved in the immune response to identify and target pathogens, such as invading bacteria, viruses, and other foreign organisms.
• White blood cells are formed continually; some only live for hours or days, but some live for years.
• Leukocytes are further classified into two subcategories:
• Granulocytes consist of neutrophils, eosinophils, and basophils.
• Agranulocytes consist of lymphocytes and monocytes.

Given:

$3^{(2x-10)} \times 81^{(2x-3)} = \frac{1}{9}$

Formula Used:

81 = 3⁴

$\frac{1}{9} = 3^{-2}$

Calculation:

$3^{(2x-10)} \times (3^4)^{(2x-3)} = 3^{-2}$

$3^{(2x-10)} \times 3^{4(2x-3)} = 3^{-2}$

$3^{(2x-10)} \times 3^{8x-12} = 3^{-2}$

$3^{(2x-10 + 8x-12)} = 3^{-2}$

$3^{10x-22} = 3^{-2}$

10x - 22 = -2

10x - 22 + 22 = -2 + 22

10x = 20

x = 2

The correct answer is option 3.

विकल्प 2, "मैं बिलकुल निर्दोष हूँ।" में 'नि' उपसर्ग का गलत प्रयोग हुआ है।

Key Points

• निर्दोष का संधि विच्छेद होगा - नि: + दोष इसमें नि के साथ विसर्ग लगा हुआ है। अतः ये बाकी विकल्पों से अलग है।
• इसमें विसर्ग संधि है।
• अन्य विकल्पों का विश्लेषण –
• निसंतान,  निवास, निबंध में केवल नि उपसर्ग का प्रयोग हुआ है।

Additional Information

• उपसर्ग वह शब्दांश या अव्यय है, जो किसी शब्द के आरंभ में जुड़कर उसके अर्थ में (मूल शब्द के अर्थ में) विशेषता ला दे या उसका अर्थ ही बदल दे। 
• जैसे- अभि + मान = अभिमान, प्र + चार = प्रचार आदि।
• विसर्ग संधि विसर्ग के साथ स्वर या व्यंजन मेल से जो विकार होता है उसे विसर्ग संधि कहते है। हम ऐसे भी कह सकते हैं- विसर्ग ( : ) के साथ जब किसी स्वर अथवा व्यंजन का मेल होता है तो उसे विसर्ग-संधि कहते हैं।
• उदाहरण:-
• अंतः + करण : अन्तकरण
• अंतः + गत : अंतर्गत
• अंतः + ध्यान : अंतर्ध्यान
• अंतः + राष्ट्रीय : अंतर्राष्ट्रीय।