The Minute Hand Of A Watch Is 1.5 Cm Along. How Far Does Its Tip Move In 40 Minutes?
In 60 minutes, the minute hand of a watch completes one revolution. In 40 minutes, the minute hand turns through... View Article
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Two Balls, A And B, Are Thrown Simultaneously, A Vertically Upward With A Speed Of 20 M/S From The Ground And B Vertically Downward From A Height Of 40 M With The Same Speed And Along The Same Line Of Motion. At What Points Do The Two Balls Collide By Taking Acceleration Due To Gravity As 9.8 M/S2?
Sol: Let the accelerations of both ball be = aA= -g, aB = -g. Let the velocities be = vA... View Article
In The Recombinant DNA Technique, The Term Vector Refers To______?
In recombinant DNA technology, the term vector refers to a plasmid or an agent used to transfer foreign DNA into... View Article
In An Ap, The Sum Of First N Terms Is 3n2/2 + 3n/2. Find The 25Th Term.
Sol: Given: \(\begin{array}{l}S_{n} = \frac{3n^{2}}{2} + \frac{13\;n}{2} \\\Rightarrow T_{25} = S_{25} – S_{24}\\\Rightarrow \frac{3(25)^{2}}{2} + \frac{13(25)}{2} – \frac{3(24)^{2}}{2} – \frac{13(24)}{2}\\\Rightarrow... View Article
A Block Of Mass M Slides Down An Inclined Right-angled Trough. If The Coefficient Of Kinetic Friction Between The Block And The Trough Is Μk, The Acceleration Of The Block Down The Plane Will Be:
Here the frictional forces are perpendicular to the plane. As there are two surfaces, So, frictional force, f =2 μk N... View Article
Magnets Are Made Of______. (A) Iron. (B) Steel. (C) Copper. (D) Both A And B.
The correct answer is (D) Both A And B. All magnets are made of a group of metals called ferromagnetic... View Article
What Is Running Multiple Programs At The Same Time Called?
Running multiple programs at the same time is called multitasking. In an operating system, multitasking allows a user to perform... View Article
What Is Faraday’s First Laws Of Electrolysis?
Faraday’s – First Law of Electrolysis Faraday’s first law of Electrolysis states that during electrolysis, the amount of chemical reaction... View Article
How Many 4 Digit Numbers Can Be Forme From Digits 1,1,2,2,3,3,4,4,5,5?
As all the digits are different, four digits can be formed in \(\begin{array}{l}^{5}P_{4} \end{array} \) ways = \(\begin{array}{l} \frac{5!}{1!} \end{array}... View Article
Which Of The Following Microbe Produces The Highest Number Of Antibiotics? (A) Bacillus. (B) Penicillium. (C) Streptomyces. (D) Cephalosporium.
The correct answer is (C) Streptomyces Streptomyces is the largest antibiotic-producing genus in the microbial world. Streptomyces is the genus... View Article
The Gas That Is Evolved During Photosynthesis Is (A) Oxygen. (B) Hydrogen. © Nitrogen. (D) Carbon Dioxide.
The correct answer is (A) Oxygen. Oxygen is released during the process of photosynthesis through the stomata. Oxygen is a... View Article
What Weight Of HNO3 Is Required To Convert 62 gms P4 To H3Po4 In The Given Reaction? P4+HNO3=H3PO4+NO2+H2O.
Given balanced chemical reaction is: P4 + 2OHNO3 → 4H3PO4 + 2O NO2 + 4H2O The molecular weight of P4 =... View Article
When The Convex Lens Acts As A Magnifying Glass, The Object Is Between The ………. And The Optical Center Of The Lens.
The answer is Principal focus. When the object is placed between the principal focus and the pole, the rays tend... View Article
Below Given Are The Daily Wages Of 110 Workers, Obtained In A Survey. Compute The Mean Daily Wages And Modal Daily Wages Of These Workers.
Sol: Given data: Daily wages (in Rs.) 100-120 120-140 140-160 160-180 180-200 200-220 220-240 Number of workers 10 15 20... View Article
The Moment Of Inertia Of The Uniform Semicircular Disc Of Mass M And Radius R About A Line Perpendicular To The Plane Of The Disc Through The Centre Is (A) Mr2.(B) 1/2 Mr.(C) 1/4 Mr2.(D) 2/5 Mr2.
The correct answer is (B) 1/2 Mr2. A circular disc will have two times the mass of the semicircular disc.... View Article
In Aqueous Solution The Ionization Constants For Carbonic Acid (H2co3) Are K1 = 4.2 × 10−7 And K2 = 4.8 × 10−11. Select The Correct Statement For A Saturated 0.034 M Solution Of The Carbonic Acid. (A) The Concentration Of CO2−3 Is 0.034 M . (B) The Concentration Of H+ Is Double That Of CO2−3 (C) The Concentration Of CO2−3 Is Greater Than That Of HCO−3. (D) The Concentration Of H+ And HCO−3 Are Approximately Equal.
The correct answer is (D). The concentration of H+ and HCO−3 are approximately equal. \(\begin{array}{l}A \rightarrow H_{2}CO_{3} \rightleftharpoons H^{+} +... View Article
An Electric Kettle Is Rated As 25 Kw 250 V. Find The Cost Of Running The Kettle For Two Hours At 60 Paise Per Unit.
As given in the question: Total unit consumed in two hours, E = 2.5 * 2 = 5 units. Cost... View Article
Which Of The Following Has Zero Electron Affinity? (A) Neon. (B) Oxygen. (C) Nitrogen. (D) Fluorine.
The correct answer is (A) Neon. Neon has zero electron affinity, which is because Neon(Ne) is a noble gas and... View Article
The Number Of Integral Values Of Lambda For Which X2 + Y2 + Lambda X + (1 -lambda) Y + 5 = 0 Is The Equation Of A Circle Whose Radius Cannot Exceed 5, Is:(A) 14.(B) 16.(C) 18.(D) 20.
The correct answer is (B) 16. As given in the question, the radius is less than or equal to 5.... View Article
Name The Four Bases Present In DNA Which One Of These Is Not Present In RNA?
The four bases present in DNA are adenine (A), guanine (G), cytosine (C) and thymine (T). The four bases present... View Article
