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A 2kg mass moving with a velocity of 3 m/sec collides head-on with a body of mass 1 kg moving in the opposite direction with a velocity of 4 m/sec. After the collision, two bodies stick together and move with a common velocity which in m/sec is equal to

a) 1/4 b) 1/3 c) 2/3 d) 3/4 Answer: c) 2/3 Solution: After the collision, the two bodies stick together and move with a common... View Article

The reading of ammeter and voltmeter in the following circuit are respectively

a) 2 A, 200 V b) 1.5 A, 100 V c) 2.7 A, 220 V d) 2.2 A, 220 V Answer: a) 2 A, 200 V Solution: VR = 200 I = VR/R = 200/100 = 2 A... View Article

A spring of spring constant k is placed horizontally on a rough horizontal surface. It is compressed against a block of mass m which is placed on the rough surface, so as to store maximum energy in the spring. If the coefficient of friction between the block and the surface is μ, the potential energy stored to the spring is: (block does not slide due to force of spring.)

a) μ2m2g2/4k b) 2μm2g2/k c) μ2m2g2/2k d) 3μ2mg2/k Answer: c) μ2m2g2/2k Solution: Maximum energy is... View Article

[latex]vec{A}[/latex] and [latex]vec{B}[/latex] are two vectors and θ is the angle between them, if
[latex]left|vec{A}times vec{B} right|=sqrt{3}(vec{A}vec{B})[/latex] the value of θ is

a) 600 b) 450 c) 300 d) 900 Answer: Solution: tan θ = √3 ⇒ θ = 600... View Article

If the system is in equilibrium (cos53⁰= 3/5), then the value of P is

a) 16 N b) 4 N c) √208 N d) √232 N Answer: c) √208 N Solution: As the system is in equilibrium, the sum of all vector forces will be zero.... View Article

Why is the lunar eclipse not visible in all the places on the night side of the earth?

The lunar eclipse occurs if the Sun, the Earth and the Moon are totally or very closely aligned with the Earth between the Sun and Moon. If you... View Article

A tunnel through a mountain for a four-lane highway is to have an elliptical opening. The total width of the highway (not the opening) is to be 16m, and the height at the edge of the road must be sufficient for a truck 4m high to clear if the highest point of the opening is to be 5m approximately. How wide must the opening be

Answer: Solution: AA' = 16 m OA = 8 cm OB = 5m Equation of ellipse = (x2/82) + (y2/52) = 1 Substituting (x1,4) in equation (1) (x12/82)... View Article

The current sensitivity of a moving coil galvanometer can be increased bya) Increasing the magnetic field of the permanent magnet b) Increasing the area of the deflecting coil c) Increasing the number of turns in the coil d) Increasing the restoring couple of the coil

The correct options are (a) , (b) and (c) Current sensitivity of the moving coil galvanometer = Current sensitivity of the moving coil... View Article

Increasing the current sensitivity of a galvanometer may not necessarily increase its voltage sensitivity. Give reasons

Solution: Current sensitivity of the moving coil galvanometer = nBA/k here n = number of turns A= area of the coil B = magnetic field... View Article

Calculate the binding energy and binding energy per nucleon (in MeV) of a nitrogen nucleus (7N14) from the following data : Mass of proton = 1.00783 u, Mass of neutron = 1.00867 u, Mass of nitrogen nucleus = 14.00307 u

Solution In 14N7 : Number of protons = 7, Number of neutron = 7 Total number of nucleons = 7 +7 =14 Mass defect (ΔM) =7 (mass of proton) +... View Article

In which one of the hydrated crystals, water molecules present in the interstitial spaces? (a) BaCl2. 2H2O (b) [Cu(H2O)2 (NH3)2] Cl2 (c)CuSO4. 5H2O (d) [Cr(H2O)5]3+ . 3Cl-

Solution: (a) BaCl2. 2H2O Interstitial water molecules found in BaCl2. 2H2O salt. There are two interstitial water present in barium chloride... View Article

The amine ‘A’ when treated with nitrous acid gives yellow oily substance. The amine A is : (a) triethylamine (b) trimethylamine (c) aniline (d) methylphenylamine

Solution: (d) Methylphenylamine Primary amines react with HNO2 evolved nitrogen Gas and from a Clear Solution Secondary amines react with HNO2... View Article

Choose the correct answer among the alternatives given, One mole of ethyl acetate on treatment with an excess of LiAlH4 in dry ether and subsequent acidification produces: (a) 1 mol of acetic acid + 1 mol of ethyl alcohol (b) 1 mol of ethyl alcohol + 1 mole of methyl alcohol (c) 2 mol of ethyl alcohol (d) 1 mol of 2-butanol

Solution: (c) Ethyl Acetate on treatment with LiAlH4 under go reductions gives 2 moles of ethyl alcohol.... View Article

If ‘n’ represents total number of asymmetric carbon atoms in a compound, the possible number of optical isomers of the compound is

Solution: Stereoisomers are compounds with the same chemical formula but different spatial arrangement. An asymmetric carbon atom (chiral... View Article

CH3CHO and C6H5CH2CHO can be distinguished chemically by : (a) Benedict test (b) Iodoform test (c) Tollen’s reagent test (d) Fehling solution test

Solution: (B) CH3CHO and C6H5CH2CHO both are adehyde so they can give the test of Tollen's reagent, Fehlings solution and Benedict's solution.... View Article

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Archives

A 2kg mass moving with a velocity of 3 m/sec collides head-on with a body of mass 1 kg moving in the opposite direction with a velocity of 4 m/sec. After the collision, two bodies stick together and move with a common velocity which in m/sec is equal to

The reading of ammeter and voltmeter in the following circuit are respectively

[latex]vec{A}[/latex] and [latex]vec{B}[/latex] are two vectors and θ is the angle between them, if
[latex]left|vec{A}times vec{B} right|=sqrt{3}(vec{A}vec{B})[/latex] the value of θ is

If the system is in equilibrium (cos53⁰= 3/5), then the value of P is

Why is the lunar eclipse not visible in all the places on the night side of the earth?

The current sensitivity of a moving coil galvanometer can be increased bya) Increasing the magnetic field of the permanent magnet b) Increasing the area of the deflecting coil c) Increasing the number of turns in the coil d) Increasing the restoring couple of the coil

Increasing the current sensitivity of a galvanometer may not necessarily increase its voltage sensitivity. Give reasons

Calculate the binding energy and binding energy per nucleon (in MeV) of a nitrogen nucleus (7N14) from the following data : Mass of proton = 1.00783 u, Mass of neutron = 1.00867 u, Mass of nitrogen nucleus = 14.00307 u

In which one of the hydrated crystals, water molecules present in the interstitial spaces? (a) BaCl2. 2H2O (b) [Cu(H2O)2 (NH3)2] Cl2 (c)CuSO4. 5H2O (d) [Cr(H2O)5]3+ . 3Cl-

The amine ‘A’ when treated with nitrous acid gives yellow oily substance. The amine A is : (a) triethylamine (b) trimethylamine (c) aniline (d) methylphenylamine

If ‘n’ represents total number of asymmetric carbon atoms in a compound, the possible number of optical isomers of the compound is

CH3CHO and C6H5CH2CHO can be distinguished chemically by : (a) Benedict test (b) Iodoform test (c) Tollen’s reagent test (d) Fehling solution test

The IUPAC name of CH3OC2H5 is: (a) Ethoxy methane (b) Methoxy ethane (c) Ethyl methyl ether (d) Methyl ethyl ether

Thomas slag is: (a) CaSiO3 (b) Ca3(PO4)2 (c) MnSiO3 (d) CaCO3 (e) none of the above

Iodoform test is not given by:(a) 2-Pentanone (b) Ethanol (c) Ethanal (d) 3-pentanone

Benzene react with CH3CH2CH2Cl in presence of AlCl3 produces

Bell metal contains 80% copper. The mass of Bell metal which contains 1.5×10^20 atoms of copper is (Cu=64)

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