Prove That Tan2 A – Sin2 A = Tan2 A * Sin 2 A
Let us first find the value of the left-hand side (LHS) \(\begin{array}{l}tan^{2} A – sin^{2} A \end{array} \) Since: \(\begin{array}{l}tan... View Article
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Glass Is Best Described As A_____(A) Solid (B) Liquid (C) Colloidal Solution (D) Supercooled Liquid
The correct answer is (D) Supercooled Liquid. Glass is considered a supercooled liquid because of its fluidity property. Explore more... View Article
The Area Of A Square Field Is 5184 M2. Find The Area Of A Rectangular Field, Whose Perimeter Is Equal To The Perimeter Of The Square Field, And Whose Length Is Twice Its Breadth.
Given: The area of a square field =\(\begin{array}{l} 5184 m^{2} \end{array} \) Therefore, the side of square\(\begin{array}{l} \sqrt{5184} = 72... View Article
………. Fixes Atmospheric Nitrogen Useful To Plants.
The answer is Nitrogen-fixing bacteria Nitrogen-fixing bacteria fix atmospheric nitrogen useful to plants. For example, Azotobacter, Rhizobium etc Explore more... View Article
A Sphere Is Dropped Under Gravity Through A Fluid Of Viscosity . If The Average Acceleration Is Half Of The Initial Acceleration. What Is The Time To Attain The Terminal Velocity?
Here, The coefficient of viscosity of the fluid = \(\begin{array}{l}\eta\end{array} \) Density of the fluid = \(\begin{array}{l}\sigma \end{array} \) Density... View Article
Give Reason: We Prefer White Clothes In Summer And Dark Coloured Clothes In Winter
We prefer white clothes in summer and dark coloured clothes in winter. This is because during summer, white coloured clothes... View Article
Closing Stock Is Always Valued At Market Price. (True/False)
The above-given statement is false. Closing stock is always valued at cost price or market price whichever is less. It... View Article
Who Among The Following Came To India During The Reign Of Sultan Mahmud Of Ghazni? (A) Sulaiman.(B) Al-masudi.(C) Al-Biruni.(D) Abdul Haq.
The correct answer is (C) Al-Biruni Or Abu Rayhan al-Biruni Explore more such questions and answers at BYJU’S.
The Radius Of A Circular Current Carrying Coil Is R . At What Distance From The Centre Of The Coil On Its Axis, The Intensity Of The Magnetic Field Will Be 122–√ Times At The Centre?
The magnetic field at the axis due to circular current \(\begin{array}{l} B_{axis} = \frac{\mu _{0}}{4\Pi}\frac{2\Pi Nir^{2}}{(x^{2}+r^{2})^{3/2}} \end{array} \) N =... View Article
A Point Object Is Placed On The Principal Axis Of The Convex Lens Of Focal Length 20Cm At A Distance 40 Cm To The Left On It. The Diameter Of The Lens Is 10Cm. If The Eye Is Placed 60Cm To The Right Of The Lens At A Distance H Below The Principal Axis, Then Max Value Of ‘h’ To See The Image Is____.
Solution: Given: Distance of object, u= − 40cm focal length, f = 20cm Now by applying the lens formula, we... View Article
DNA Probe Is Used For_____.
The DNA probe is a radioactively labelled DNA variable length that can then be used in: To find whether a... View Article
Hydrogen Bond Energy Is Equal To ______
The answer is 3 – 10 kcals Depending on geometry and environment, the hydrogen bond free energy content is between... View Article
The Product Of Three Numbers In G.P. Is 216. If 2,8,6 Be Added To Them, The Results Are In A.P. Find The Numbers.
Let the numbers be: \(\begin{array}{l} \frac{a}{r},a, ar \end{array} \) \(\begin{array}{l}\frac{a}{r} * a * ar = 216 \end{array} \) \(\begin{array}{l}a^{3} =... View Article
Vapour pressure of pure benzene is 119 torr and of toluene is 37.0 torr at the same temperature mole fraction of toluene in vapour phase which is in equilibrium with a solution of benzene and toluene having a mole fraction of toluene 0.50, will be:
Sol: Partial pressure = Mole fraction * Total pressure \(\begin{array}{l} \Rightarrow X_{A}P_{A}^{\circ} = Y_{A}P_{T} \end{array} \) \(\begin{array}{l} Y_{A} \end{array} \)... View Article
The Decreasing Order Of Boiling Points Of The Following Alcohols
The correct answer is (A) Pentan-1-ol > 3-methylbutan-2-ol > 2-methylbutan-2-ol The boiling point of alcohol is determined by the ease... View Article
Limiting Molar Conductance Of H And CH3COO- Ions Are 344 and 40 Respectively. Molar Conductance Of 0.008 M CH3COOH is 48. What Will Be The Value Of Ka For CH3COOH
\(\begin{array}{l} \lambda _{m(CH_{3}COOH)}^{\infty} = \lambda _{m}^{\infty} (H^{+}) + \lambda _{m(CH_{3}COOH^{-})}^{\infty} \end{array} \) = 344 + 40 = 384 \(\begin{array}{l} \lambda... View Article
The reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is (A) Hydrocyanic acid. (B) A Grignard reagent. (C) Hydrazine in the presence of a feebly acidic solution. (D) None of these
The correct answer is (C) Hydrazine in presence of a feebly acidic solution. Explore more such questions and answers at... View Article
If The Breaking Force For A Given Wire Is F, Then The Breaking Force Of Two Wires Of The Same Magnitude Will Be _____.
Sol: Force = Stress * Area \(\begin{array}{l} F = s * \Pi r^{2}\end{array} \) Hence, \(\begin{array}{l} F = \alpha r^{2}\end{array}... View Article
A Man Is Facing North-west. He Turns 90 In The Clockwise Direction And Then 135 In The Anti-clockwise Direction. Which Direction Is He Facing Now?
Turning 90 from North-west clockwise means, man is facing North-east from North-east moving 135 anti-clockwise means man is now facing... View Article
A container contains two immiscible liquids of density ρ 1 and ρ 2 (ρ 2 >ρ 1 ). A capillary of radius r is inserted in the liquid so that its bottom reaches up to denser liquid. Denser liquid rises in capillary and attains height equal to h which is also equal to column length of lighter liquid. Assuming zero contact angle find the surface tension of the heavier liquid.
Sol: As given options: (A) \(\begin{array}{l} 2\Pi \rho_{2}gh \end{array} \) (B) \(\begin{array}{l} \frac{r\rho_{2}gh}{2} \end{array} \) (C) \(\begin{array}{l} 2\Pi r(\rho_{2} –... View Article
