Recent questions tagged 56

Average velocity of a particle executing SHM in one complete vibration is :

asked Jul 8, 2019 by pady_1

1 answer

As per the modern periodic law the physical and chemical properties of elements are periodic functions of their :

asked Dec 19, 2018 by pady_1

0 answers

Which of the following is the weakest acid in its aqueous solution ?

asked Dec 19, 2018 by pady_1

0 answers

Which of the following is a sulphide ore ?

asked Dec 19, 2018 by pady_1

0 answers

During the electrolytic reduction of alumina, the reaction at cathode is :

asked Dec 11, 2018 by pady_1

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A solid sphere, a hollow sphere and a ring are released from top of an inclined plane (frictionless) so that they slide down the plane. Then maximum acceleration down the plane is for (no rolling ) :

asked Dec 11, 2018 by pady_1

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A Carnot engine takes $3 \times 10^6$ cal of heat from a reservoir at $627^{\circ}C$ and gives it to a sink at $27^{\circ}C$. The work done by the engine is :

asked Dec 11, 2018 by pady_1

0 answers

The length of the projection of the line segment joining the points $(5, -1, 4)$ and $(4, -1, 3)$ on the plane, $x+y+z=7$ is

asked Dec 11, 2018 by pady_1

1 answer

When a current of $5 \;mA$ is passed through a galvanometer having a coil of resistance $15 \; \Omega$, it shows full scale defection. The value of the resistance to be put in series with the galvanometer to convert it into a voltmeter of range $0 – 10\; V$ is :

asked Dec 11, 2018 by pady_1

0 answers

In the Hofmann bromamide degradation reaction, the number of moles of $NaOH$ and $Br_2$ used per mole of amine produced are :

asked Dec 11, 2018 by pady_1

0 answers

Arrange the following amines in the order of increasing basicity.

asked Dec 11, 2018 by pady_1

0 answers

Three positive numbers from an increasing G.P. If the middle term in this G.P. is doubled, the new numbers are in A.P. Then the common ratio of the G.P. is

asked Dec 11, 2018 by pady_1

1 answer

A multiple choice examination has 5 questions. Each question has three alternative answers of which exactly one is correct. The probability that a student will get 4 or more correct answers just by guessing is

asked Dec 11, 2018 by pady_1

1 answer

An object 2.4 m in front of a lens forms a sharp image on a film 12 cm behind the lens. A glass plate 1 cm thick, of refractive index 1.50 is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object be shifted to be in sharp focus on film ?

asked Dec 11, 2018 by pady_1

0 answers

Let A and B be two symmetric matrices of order 3. Statement-1 : A (BA) and (AB) A are symmetric matrices. Statement -2 : AB is symmetric matrix if matrix multiplication of A and B is commutative.

asked Dec 11, 2018 by pady_1

0 answers

An initially parallel cylindrical beam travels in a medium of refractive index $\mu(I) = \mu_0 + \mu_2I$, where $\mu_0 $ and $\mu_2$ are positive constants and $I$ is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius. Question : As the beam enters the medium, it will

asked Dec 11, 2018 by pady_1

0 answers

The two functional groups present in a typical carbohydrate are:

asked Nov 29, 2018 by pady_1

0 answers

Which one of the following constitutes a group of the isoelectronic species?

asked Nov 29, 2018 by pady_1

0 answers

The half-life period of a radioactive element X is same as the mean life time of another radioactive element Y. Initially they have the same number of atoms. Then :

asked Nov 29, 2018 by pady_1

0 answers

$HBr$ reacts with $CH_2 = CH - OCH_3$ under anhydrous conditions at room temperature to give :

asked Nov 13, 2018 by pady_1

0 answers

Let $A$ and $B$ be two events such that $P (\overline{A \cup B}) = \frac{1}{6}, ( A \cap B) = \frac{1}{4}$ and $P (\overline{A}) = \frac{1}{4}$, where $\overline{A}$ stands for complement of event $A$. Theus events $A$ and $B$ are :

asked Nov 5, 2018 by pady_1

0 answers

A charged ball B hangs from a silk thread S, which makes an angle $\theta$ with a large charged conducting sheet P, as shown in the figure. The surface charge density $\sigma$ of the sheet is proportional to :

asked Nov 5, 2018 by pady_1

0 answers

Distance between two parallel planes $2x+y+2z=8$ and $4x+2y+4z+5=0$ is

asked Nov 5, 2018 by pady_1

0 answers

When initial concentration of the reactant is doubled, the half-life period of a zero order reaction

asked Aug 21, 2018 by pady_1

2 answers

Which of the following options gives the correct sequences of events during mitosis ?

asked Aug 21, 2018 by pady_1

1 answer

Which of the following statements is not correct ?

asked Aug 21, 2018 by pady_1

1 answer

Choose the wrong statement -

asked Aug 21, 2018 by pady_1

1 answer

The weight of silver (at.wt. = 108) displaced by a quantity of electricity which displaces 5600 ml of $O_2$ at STP will be -

asked Aug 20, 2018 by pady_1

2 answers

Maximum deviation from ideal gas is expected from :

asked Aug 20, 2018 by pady_1

1 answer

Which of the following species contains three bond pairs and one lone pair around the central atoms ?

asked Aug 20, 2018 by pady_1

1 answer

Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular mass of A is 49 u. Molecular mass of B will be :

asked Aug 16, 2018 by pady_1

1 answer

Which of the following complex ion is not expected to absorb visible light?

asked Jul 26, 2018 by pady_1

1 answer

The ionization constant of ammonium hydroxide is $1.77\times10^{-5}$ at 298 K. Hydrolysis constant of ammonium chloride -

asked Jul 26, 2018 by pady_1

1 answer

What volume of oxygen gas ($O_2$ ) measured at 0ºC and 1 atm, is needed to burn completely one litre, of propane gas ($C_3H_8$) measured under the same conditions ?

asked Jul 26, 2018 by pady_1

1 answer

In a first order reaction $[A \to B$ ], if $k$ is rate constant and initial concentration of the reactant A is 0.5 M then the half-life is :

asked Jul 26, 2018 by pady_1

0 answers

During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process: $Proteins \xrightarrow{Enzyme(A)} Polypeptides \xrightarrow{Enzyme(B)} Amino\; acids$, are respectively-

asked Jul 25, 2018 by pady_1

1 answer

A reaction occurs spontaneously if -

asked Jul 24, 2018 by pady_1

2 answers

A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid :-

asked Jul 24, 2018 by pady_1

1 answer

The pyknometric density of sodium chloride crystal is $2.165 \times 10^3 kg\; m^{–3}$ while its X-ray density is $2.178 \times 10^3 kg \; m^{–3}$. The fraction of unoccupied sites in sodium chloride crystal is :

asked Jul 24, 2018 by pady_1

1 answer

Which has highest pH : -

asked Jul 23, 2018 by pady_1

1 answer

Which of the following is incorrect :-

asked Jul 20, 2018 by pady_1

1 answer

In Friedal craft reaction Toluene can be prepared by :

asked Jul 20, 2018 by pady_1

1 answer

Which of the following is not the characteristic of arenes :

asked Jun 15, 2018 by pady_1

1 answer

The lower limit of the class 20-40 is

asked Dec 31, 2015 by pady_1

1 answer

A rectangular red sticker is 16 millimetres wide and 2 millimetres tall. What is its perimeter?

asked Dec 31, 2015 by pady_1

0 answers

Convert 2$\large\frac{14}{15}$ to improper fraction.

asked Dec 31, 2015 by pady_1

0 answers

When 21 is added to 30\% of a number, it gives the number itself. The number is

asked Dec 31, 2015 by pady_1

0 answers

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