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Which kind of waves are used in sonography? (A) Infrared waves (B) Micro waves (C) Sound waves (D) Ultrasonic waves

Ultrasonic waves are used in sonography. Hence, the correct option is (D)... View Article

Write the types of infrastructure

The types of infrastructures are as follows: Economic infrastructure: This infrastructure is directly linked with the economic development of a... View Article

What is the function of myelinated sheath in a neuron?

A sheath that forms around nerves is known as myelin sheath. It consists of fat containing cells. The myelin sheath acts as an insulator which... View Article

Is the buoyant force on a submerged object equal to the weight of the object itself or equal to the weight of the fluid displaced by the object?

When we submerge an object in a fluid, an upward force is experienced by the object. The fluid applies this force on the object, which causes it... View Article

Give examples of slow reaction

The changes happening over a long period of time are considered slow changes. Examples: Rusting of iron, fruits ripening and growing of trees.... View Article

DNA replication requires which of the following enzymes? (A) DNA polymerase only (B) DNA polymerase and ligase (C) Ligase only (D) RNA polymerase

DNA replication requires DNA polymerase and ligase. Therefore, the correct option is (B)... View Article

The total number of industries in a particular portion of the country is approximately 1600. If the government has decided to increase the number of industries in the area by 20% every year. Find the approximate number of industries after 2 years

Let P be the present number of industries in a particular portion of the country Hence, from the question P = 1600 Given that the government has... View Article

The IUPAC name of dimethyl ether is: (A) ethoxymethane (B) methoxymethane (C) methoxyethane (D) ethoxyethane

The IUPAC name of dimethyl ether is methoxymethane. Therefore, the correct option is (B)... View Article

What is true of plasmid? (A) Found in viruses (B) Contains genes for vital activities (C) Part of nuclear chromosome (D) Widely used in gene transfer

Widely used in gene transfer Extrachromosomal genetic material found in certain bacteria are known as Plasmid. They replicate independently. They... View Article

09 Sep 2021: The Hindu Analysis

UPSC Current Affairs Preparation: The Hindu Analysis Watch expert analysis of ‘The Hindu’ dated 9th Sep 2021. Important news and views to boost... View Article

When 1 mole of gas is heated at constant volume, the temperature is raised from 298 to 308 K and heat supplied to gas is 500 J. Which of the following statements is true?(A) q = w = 500J, ΔU=0.(B) ΔU = 0, q = w = -500J.(C) q = ΔU = 500J, w = 0.(D) q = -w = 500J, ΔU = 0.

The correct answer is (C) q = ΔU = 500J, w = 0. According to the first law of thermodynamics: Given q = 500 J Therefore, Hence... View Article

Identify the function of the following: The trachea and bronchi are provided with C-shaped cartilaginous rings which (A) Give support to lungs. (B) Divide trachea and bronchi. (C) Are responsible for sound production. (D) Give them support and prevent their collapse.

The correct answer is (D) Give Them Support And Prevent Their Collapse. The cartilage ring is C-shaped because the trachea presses against the... View Article

Which of the following best describes an array_______.(A) Array is not a data structure. (B) Arrays are immutable once initialised. (C) Container of objects of similar types. (D) A data structure that shows a hierarchical behavior.

The correct answer is (C) Container Of Objects Of Similar Types. Explore more such questions and answers at BYJU’S.... View Article

A metal m readily forms its sulphate mso4 which is water soluble. it forms its oxide mo which becomes inert on heating. it forms an insoluble hydroxide m(oh)2 which is soluble in NaOH solution. then m is :(a) Ba.(b) be.(c) Ca.(d) Mg.

The correct answer is (B) Be. The metal M is Be. The solubility of alkaline earth metal decreases as we move down in the periodic table. The... View Article

Starting from rest ,a body slides down a 45° inclined plane in twice the time takes to slide down the same distance in the absence of friction .The coefficient of friction between the body and inclined plane is

Sol: Case: 1 When there is no friction: From newton's second law, Force = mass * acceleration. As the body starts from rest, the... View Article

The Anomalous Behaviour Of Nitrogen Is Due To______. (A) Ease Of Multiple Bond Formation. (B) Small Size And High Electronegativity. (C) Non-availability Of D-orbitals In The Valence Shell. (D) All Of These.

The correct answer is (D) All Of These. Nitrogen (N), being small in size, highly electronegative, has a high ionization energy and... View Article

Sangers Reagent Is Used For The Identification Of :(A) Side Chain Of Amino Acids. (B) N-terminal Of The Peptide Chain.(C) C-terminal Of The Peptide Chain.(D) Molecular Weight Of The Peptide Chain

The correct answer is (B) N-terminal Of The Peptide Chain. Explore more such questions and answers at BYJU’S.... View Article

If resistivity of pure silicon is 3000 Ω m and the electron and hole mobilities are 0.12 m²v⁻¹s⁻¹ and 0.045 m²v⁻¹s⁻¹ respectively, determine. The resistivity of a specimen of the material when 10¹⁹ atoms of phosphorous are added per m³ Given e= 1.6 × 10⁻¹⁹ c, p=3000 Ω m, μe = 0.12m²v⁻¹s⁻¹ , μh = 0.045m²v⁻¹s⁻¹

Sol: The resistivity of pure silicon (Si) is given by When , the semiconductor becomes an n-type semiconductor. Therefore,... View Article

Give two uses of diamond

The two uses of diamond are as follows: 1. They are used in jewellery (such as earrings, nose rings, engagement rings, pendants, etc.) due to... View Article

12 men and 16 boys can do a piece of work in 5 days 13 men and 24 boys can do it in 4 days. The ratio of the daily work done by a man to that of a boy is (A) 2:1 (B) 3:1 (C) 3:2 (D) 5:4

Let us assume Boy finish the work in x days and man finish the work in y days So, One day work of a boy = 1/x and one day work of a man = 1/y One... View Article

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