IIT JEE Practice Question and Answer

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Answer : 1. "TRUE"
Explanation :

Answer: A) TRUE Explanation: Since the Gaslight Commons costs more than the Riverdale Manor and the Livingston Gate costs more than the Gaslight Commons, it is true that the Livingston Gate costs the most.

Q: Two parallel chords on the same side of the centre of a circle are 5 cm apart. If the chords are 20 and 28 cm long, what is the radius of the circle? 1072 0

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    14.69 cm
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    15.69 cm
    Correct
    Wrong
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    18.65 cm
    Correct
    Wrong
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    16.42 cm
    Correct
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Answer : 2. "15.69 cm"
Explanation :

Answer: B) 15.69 cm Explanation: Draw the two chords as shown in the figure. Let O be the center of the circle. Draw OC perpendicular to both chords. That divides the two chords in half.So CD = 10 and AB = 14. Draw radii OA and OD, both equal to radius r.We are given that BC = 5, the distance between the two chords. LetOB = x. We use the Pythagorean theorem on right triangle ABO AO² = AB² + OB² r² = 14² + x² We use the Pythagorean theorem on right triangle DCO DO² = CD² + OC² We see that OC = OB+BC = x+5, so r² = 10² + (x+5)² So we have a system of two equations: r² = 14² + x² r² = 10² + (x+5)² Since both left sides equal r², set the right sidesequal to each other. 14² + x² = 10² + (x+5)² 196 + x² = 100 + x² + 10x + 25 196 = 125 + 10x 71 = 10x 7.1 = x r² = 14² + x² r² = 196 + (7.1)² r² = 196 + 50.41 r² = 246.41 r = √246.41 r = 15.69745202 cm

Q: What process never occurs in interphase? 1072 0

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Answer :
Explanation :

Absence of cell division is the process that never comes in interphase.

Q: Atoms Are Composed Of 1072 0

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    Electrons and Protons
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    Protons and Nuclei
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    Only Electrons
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    Electrons and Nuclei
    Correct
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Answer : 4. "Electrons and Nuclei"
Explanation :

Answer: D) Electrons and Nuclei Explanation: Atoms are composed of Electrons, protons and Neutrons. Protons and Neutrons together called as Nuclei.

Q: Why is burning coal a major source of pollution? 1072 0

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Answer :
Explanation :

Coal is chemically complex fuel. Whenever it is burned, gases are given off and particles of ash, called "fly ash," are released. Release of sulfur from burning into the air. The sulfur in coal combines with oxygen to form sulfur dioxide, which can be a major source of air pollution if emitted in large enough quantities. This stuff comes back as acid rain when it attaches itself to a raindrop.    Today, many of the effects of coal burning have been reduced significantly or eliminated. This is super-nasty and is only stopped by buying low-sulfur coal from Montana or Wyoming. The eastern power plants have to pay to move the coal from out west and this increases the price of power production.

Q: What is the theme of 2017 World Migratory Bird Day ? 1071 0

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    Their future is our future – a healthy planet for migratory birds and people
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    Networking for migratory birds
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    Energy: make it bird friendly
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    Destination flyways: Migratory bird and Tourism
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Answer : 1. "Their future is our future – a healthy planet for migratory birds and people"
Explanation :

Answer: A) Their future is our future – a healthy planet for migratory birds and people Explanation: World Migratory Bird Day (WMBD) was initiated in 2006 and is an annual awareness-raising campaign highlighting the need for the conservation of migratory birds and their habitats. It has a global outreach and is an effective tool to help raise global awareness of the threats faced by migratory birds, their ecological importance, and the need for international cooperation to conserve them. Day for World Migratory Bird Day celebrations is 10 May.

Q: Which of the following is known as the Electronic City of India? 1071 0

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    Hyderabad
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    Mumbai
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    Bengaluru
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    Wrong
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    Gurgaon
    Correct
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Answer : 3. "Bengaluru"
Explanation :

Answer: C) Bengaluru Explanation: Bengaluru city is known as the Electronic City of India. Because Electronic City is an IT hub in Anekal taluk of Bengaluru, Karnataka, India. It is one of India's largest electronic industrial parks in 3 phases i.e, in Konappana Agrahara and Doddathogur villages, Bengaluru.

Q: Plant development is influenced by 1071 0

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    quality, quantity and duration of light
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    Wrong
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    quality and duration of light
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    quality and quantity of light
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    quality of light only
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Answer : 1. "quality, quantity and duration of light"
Explanation :

Answer: A) quality, quantity and duration of light Explanation: Plants and animals are separated by about 1.5 billion years of evolutionary history. They have evolved their multicellular organization independently but using the same initial toolkit — the set of genes inherited from their common unicellular eucaryotic ancestor. Two basic peculiarities of plants are: First, they get their energy from sunlight, not by ingesting other organisms. This dictates a body plan different from that of animals. Second, their cells are encased in semirigid cell walls and cemented together, preventing them from moving as animal cells do. This dictates a different set of mechanisms for shaping the body and different developmental processes to cope with a changeable environment. Because they cannot match themselves to their environment by moving from place to place, plants adapt instead by altering the course of their development. Their strategy is opportunistic. A given type of organ—a leaf, a flower, or a root, say—can be produced from the fertilized egg by many different paths according to environmental cues.   Hence, Plant development is influenced by quality, quantity and duration of light.

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