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Recent questions tagged 2013

Diameter of a plano - convex lens is $6\;cm$ and thickness at the centre is $3\;mm$. If speed of light in material of lens is $2 × 10^8\; m/s,$ the focal length of the lens is :

asked Mar 28, 2017 by meena.p

1 answer

A circular loop of radius $0.3\; cm$ lies parallel to a much bigger circular loop of radius $20\; cm$. The centre of the small loop is on the axis of the bigger loop. The distance between their centres is $15 cm$. If a current of $2.0\;cm$ A flows through the smaller loop, then the flux linked with bigger loop is:

asked Mar 28, 2017 by meena.p

1 answer

A sonometer wire of length $1.5\;m$ is made of steel. The tension in it produce an elastic strain of $1\%$.What is the fundamental frequency of steel if density and elasticity of steel are $7.7 \times 10^3\; kg / m^3$and $2.2 \times 10^{11}\; N/m^2$ respectively ?

asked Mar 27, 2017 by meena.p

1 answer

Two capacitors $C_1$ and $C_2$ are charged to $120\;V$ and $200\; V$ respectively. It is found that by connecting them together the potential on each one can be made zero. Then :

asked Mar 27, 2017 by meena.p

1 answer

The amplitude of a damped oscillator decreases to $0.9$ times its original magnitude in $5s$. In another $10\;s$ it will decrease to α times its original magnitude, where $\alpha$ equals :

asked Mar 27, 2017 by meena.p

1 answer

A Projectile is given an initial velocity of $(\hat{i}+2 \hat{j})m/s,$ where $\hat i$ is along the ground and $\hat j$ is along the vertical. If $g = 10 m/s^2,$ the equation of its trajectory is :

asked Mar 27, 2017 by meena.p

1 answer

Let $[\in_0]$ denote the dimensional formula of the permittivity of vacuum. If M = mass, L = length, T = Time and A = electric current, then:

asked Mar 27, 2017 by meena.p

1 answer

This question has statement I and Statement II. Of the four choice given after the statements,choose the one that best describes the two statements.<br> Statement – I : A Point particle of mass m moving with speed v collides with stationary pointparticle of mass M. If the maximum energy loss possible is given as $f \bigg(\large\frac{1}{2}$$mv^2\bigg) $ then $f= \bigg(\large\frac{m}{M+m}\bigg)$<br> Statement – II : Maximum energy loss occurs when the particles get stuck together as a result ofthe collision.

asked Mar 22, 2017 by meena.p

1 answer

A metallic rod of length $‘A’$ is tied to a string of length $2A$ and made to rotate with angular speed $\omega$ on a horizontal table with one end of the string fixed. If there is a vertical magnetic field ‘B’ in the region, the e.m.f. induced across the ends of the rod is :

asked Mar 22, 2017 by meena.p

1 answer

A uniform cylinder of length L and mass M having cross - sectional area A is suspended, with its length vertical, from a fixed point by a massless spring, such that it is half submerged in a liquid of density σ at equilibrium position. The extension $x_0$ of the spring when it is in equilibrium is : (Here, k is spring constant)

asked Mar 22, 2017 by meena.p

1 answer

Which one of the following reactions is not correct?

asked Oct 21, 2013 by thanvigandhi_1

0 answers

Which one of the following reactions is not correct?

asked Oct 21, 2013 by thanvigandhi_1

0 answers

IUPAC name of

asked Oct 15, 2013 by thanvigandhi_1

1 answer

The correct Fischer projection formula of (2R, 3R)-2, 3-dihydroxy butanoic acid is

asked Oct 15, 2013 by thanvigandhi_1

1 answer

Which one of the following reactions is not correct?

asked Oct 15, 2013 by thanvigandhi_1

0 answers

$X \: \underleftarrow {HI} $ Glucose $ \underrightarrow {HNO_3}\: Y$

asked Oct 14, 2013 by thanvigandhi_1

1 answer

The temperature coefficient of a reaction is 2.5. If its rate constant at $ T_1K$ is $ 2.5 \times 10^{-3}s^{-1}$, the rate constant at $T_2K$ in $s^{-1}$ is : ( $ T_2 > T_1)$

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Atoms of an element 'A' occupy $ \large\frac{2}{3}$ tetrahedral voids in the hexagonal closed packed ( hcp) unit cell lattice formed by the element 'B' . The formula of the compound formed by 'A' and 'B' is

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Molar conductances of $BaCl_2, H_2SO_4\: and HCl$ at infinite dilution are $X_1,X_2\: and \: X_3$ respectively. Molar conductance of $ BaSO_4$ at infinite dilusion is

asked Oct 14, 2013 by thanvigandhi_1

1 answer

A certain quantity of electricity is passed through aqueous $AI_2\: (SO_4)_3\: and \: CuSO_4$ solutions connected in series. 0.09 g of $AI$ is deposited on cathode during electrolysis. The amount of copper deposited on cathode in grams is :

asked Oct 14, 2013 by thanvigandhi_1

1 answer

The boiling point of a solution containing 68.4 g of sucrose ( molar mass = 34.2 g $mol^{-1}$) in 100 g of water is :

asked Oct 14, 2013 by thanvigandhi_1

1 answer

The weight in g, of the non-volatile solute urea $(NH_2CONH_2)$ to be dissolved in 100 g of water in order to decrease its vapour pressure by 1.8% is:

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Two gases of molecular masses $ M_A\: and \: M_B$ are at temperatures $T_A\: and \:T_B$ respectively. If $T_AM_B=T_BM_A$ , which one of the following properties has the same value for both the gases?

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Consider the following statements for the reaction

asked Oct 14, 2013 by thanvigandhi_1

1 answer

The total number of antibonding electrons in $N_2\: and \: O_2$ molecules respectively is :

asked Oct 14, 2013 by thanvigandhi_1

1 answer

The number of $ \sigma\: and \: \pi$ bonds present in acetylene are respectively

asked Oct 14, 2013 by thanvigandhi_1

1 answer

The correct order of atomic radius of $Li, Be\: and \: B $ is

asked Oct 14, 2013 by thanvigandhi_1

1 answer

If the uncertainty in velocity of a moving object is $ 1.0 \times 10^{-6}\: ms^{-1}$ and the uncertainty in its position is 58 m, the mass of this object is approximately equal to that of : $ (h=6.626 \times 10^{-34}js)$

asked Oct 14, 2013 by thanvigandhi_1

1 answer

The energy required to overcome the attractive forces on the electrons, w, of some metals is listed below . The number of metals showing photoelectric effect when light of 300 nm wavelength falls on it is :

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Sodium thiosulphate reacts with $dil\: HCI$ to form $NaCI,H_2O, \underline X\: and \: \underline Y.\: \underline X$ reacts with $Na_2S$ to form $Na_2S_2O_3$ and $ \underline Y$ . Which one of the following is $ \underline Y$.

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Observe the following statements :

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Assertion (A) : $GeF_4$ and $SiCI_4$ act as Lewis bases. Reasons (R) : $Ge$ and $Si$ have d-orbitals to accept electrons.

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Observe the following statements :

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Orange red coloured monoxide is :

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Zinc reacts with hot and concentrated NaOH and forms :

asked Oct 14, 2013 by thanvigandhi_1

1 answer

In which of the following reactions $ H_2O_2$ acts as oxidizing agent?

asked Oct 14, 2013 by thanvigandhi_1

1 answer

In the reaction

asked Oct 14, 2013 by thanvigandhi_1

1 answer

If the solubility product of $MgF_2$ at a certain temperature is $ 1.08 \times 10^{-10}$ , its solubility in mol $1^{-1}$ is:

asked Oct 14, 2013 by thanvigandhi_1

1 answer

For the equilibrium $A_{(g)} \rightleftharpoons B_{(g)}+C_{(g)} ;K_p=0.82 atm$ at $27^{\circ}C$. At the same temperature its $K_c$ in mol $lit^{-1}$ is : ( R=0.082 lit atm $mol^{-1}K^{-1}$)

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Fluorine reactes with $ KHSO_4$ to form HF and $ \underline X$. Which one of the following is $ \underline X$?

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Identify the correct set

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Observe the following statements :

asked Oct 14, 2013 by thanvigandhi_1

1 answer

During the manufacture of cast iron, the slag ($ CaSiO_3$) is formed in

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Match the following :

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Carbon and Hydrogen in an organic compound are detected as

asked Oct 13, 2013 by thanvigandhi_1

1 answer

Which one of the following causes cancer?

asked Oct 13, 2013 by thanvigandhi_1

1 answer

Which one of the following ischloropicrin?

asked Oct 13, 2013 by thanvigandhi_1

0 answers

The pair of chemicals used as food for yeast in the fermentation of molasses is :

asked Oct 13, 2013 by thanvigandhi_1

1 answer

The order of basic strength of $C_6H_5NH_2$ (1), $C_2H_5NH_2$ (2), $(C_2H_5)_2NH $ (3) and $NH_3$ (4) is :

asked Oct 13, 2013 by thanvigandhi_1

1 answer

Identify the pair of condensation polymers from the following :

asked Oct 13, 2013 by thanvigandhi_1

1 answer

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