Recent questions tagged 47

Increase in temperature of a gas filled in a container would lead to :

asked Jul 8, 2019 by pady_1

1 answer

Among electron, proton, neutron and $\alpha$-particle the maximum penetraion capacity is for :

asked Dec 19, 2018 by pady_1

0 answers

In a nuclear reactor, material used for control rods is :

asked Dec 19, 2018 by pady_1

0 answers

The frequency of a stretched uniform wire under tension is in resonance with the fundamental frequency of a closed tube. If the tension in the wire is increased by 8 N, it is in resonance with the first over-tone of the closed tube. The initial tension in the wire is :

asked Dec 19, 2018 by pady_1

0 answers

A mercury drop of radius 1 cm is sprayed into $10^6$ drop of equal size. The energy expanded in joules is : (Surface tension of mercury is $460 \times 10^{-3} N/m$)

asked Dec 11, 2018 by pady_1

0 answers

Initial angular velocity of a circular disc of mass $M$ is $\omega_1$. Then two small spheres of mass $m$ are attached gently to two diametrically opposite point on the edge of the disc. What is the final angular velocity of the disc ?

asked Dec 11, 2018 by pady_1

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Which of the following cannot be emitted by radioactive substances during their decay ?

asked Dec 11, 2018 by pady_1

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A straight line through a fixed point $(2, 3)$ intersects the coordinate axes at distinct points P and Q. If O is the origin and the rectangle OPRQ is completed, then the locus of R is

asked Dec 11, 2018 by pady_1

1 answer

In the above circuit the current in each resistance is :

asked Dec 11, 2018 by pady_1

0 answers

Which of the following compounds is metallic and ferromagnetic ?

asked Dec 11, 2018 by pady_1

0 answers

An aqueous solution of a salt $X$ turns blood red on treatment with $SCN^-$ and blue on treatment with $K_4 [Fe(CN)_6 ]$. $X$ also gives a positive chromyl chloride test. The salt $X$ is :

asked Dec 11, 2018 by pady_1

1 answer

If f and g are differentiable functions in $[0, 1]$ satisfying $f(0) = 2 = g(1), g(0) = 0 $ and $f(1) = 6$, then for some $c \in ]0, 1[$

asked Dec 11, 2018 by pady_1

1 answer

Let $T_n$ be the number of all possible triangles formed by joining vertices of an n-sided regular polygon. If $T_{n+1} - T_n = 10$, then the value of $n$ is

asked Dec 11, 2018 by pady_1

1 answer

A thin liquid film formed between a U-shaped wire and a light slider supports a weight of $1.5 \times 10^{-2}N$ (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is

asked Dec 11, 2018 by pady_1

0 answers

Let $I$ be the purchase value of an equipment and $V(t)$ be the value after it has been used for $t$ years. The value $V(t)$ depreciates at a rate given by diferential equation $\frac{dV(t)}{dt} = -k(T-t)$, where $k>0$ is a constant and $T$ is the total life in years of the equipment. Then the scrap value $V(T)$ of the equipment is

asked Dec 11, 2018 by pady_1

0 answers

The respective number of significant figures for the numbers $23.023, 0.0003$ and $2.1 \times 10^{–3}$ are

asked Dec 11, 2018 by pady_1

0 answers

Solid $Ba(NO_3)_2$ is gradually dissolved in a $1.0 \times 10^{-4} M\; Na_2CO_3$ solution. At what concentration of $Ba^{2+}$ will a precipitate begin to form ? ($K_{sp}$ for $BaCO_3 = 5.1 \times 10^{-9} $ ).

asked Nov 29, 2018 by pady_1

0 answers

Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below: $\large\frac{1}{2}$$ Cl_2(g) \underrightarrow{\qquad \frac{1}{2} \Delta {diss} H^{-} \qquad } Cl(g) \underrightarrow{\qquad \Delta {eg} H^{-}\qquad} Cl^{-}(g) \underrightarrow{\qquad \Delta _{hyd} H^{-}\qquad } Cl^{-}(aq)$ The energy involved in the conversion of $\frac{1}{2}Cl_2(g) to Cl^{-}(g)$ (using the data , $\Delta_{diss}H^{\Theta}_{Cl_2}=240 KJmol^{-1}$ ,$\Delta_{eg}H^{\Theta}_{Cl}=-349 KJmol^{-1}$ , $\Delta_{hyd}H^{\Theta}_{Cl}=-381 KJmol^{-1}$)

asked Nov 29, 2018 by pady_1

0 answers

A current $I$ flows along the length of an infinitely long, straight, thin walled pipe. Then :

asked Nov 29, 2018 by pady_1

0 answers

A thin circulr ring of mass m and radius R is rotating about its axis with a constant angular velocity $\omega$. Two objects each of mass M are attached gently to the opposite ends of a diameter of the ring. The ring now rotates with an angular velocity $\omega'$.

asked Nov 13, 2018 by pady_1

0 answers

If non-zero numbers $a, b, c$ are in HP, then the straight line $\frac{x}{a} +\frac{y}{b} + \frac{1}{c} = 0$ always passes through a fixed point. That point is :

asked Nov 5, 2018 by pady_1

0 answers

A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 V, the resistance in Ohm's needed to be connected in series with the coil will be :

asked Nov 5, 2018 by pady_1

0 answers

If the sum of the slopes of the lines given by $x^2 - 2cxy -7y^2 =0$ is four times their product, then $c$ has the value

asked Nov 5, 2018 by pady_1

0 answers

The diffrence between amylose and amylopectin is

asked Aug 21, 2018 by pady_1

1 answer

The vascular cambium normally gives rise to :

asked Aug 21, 2018 by pady_1

1 answer

The coconut water from tender coconut represents :

asked Aug 21, 2018 by pady_1

1 answer

Which one is a wrong statement ?

asked Aug 21, 2018 by pady_1

2 answers

Calculate the energy in corresponding to light of wavelength 45nm : (Planck's constant $h = 6.63 \times 10^{-34} Js$ : speed of light $c = 3 \times 10^8 ms^{-1}$)

asked Aug 20, 2018 by pady_1

1 answer

What is the maximum numbers of electrons that can be associated with the following set of quantum numbers ? n = 3, l = 1 and m = -1

asked Aug 20, 2018 by pady_1

2 answers

The figure shown a logic circuit with two inputs A and B and the output C. The voltage wave farms across A, B and C are given. The logic circuit gate is

asked Aug 20, 2018 by pady_1

1 answer

A transistor is operated in common emitter configuration at $V_C = 2V$ such that a change in the base current from 100 µA to 300 µA produces a change in the collector current from 10 mA to 20 mA. The current gain is :

asked Aug 16, 2018 by pady_1

1 answer

Electromagnets are made of soft iron because soft iron has –

asked Jul 26, 2018 by pady_1

1 answer

Sodium has body centred packing. Distance between two nearest atoms is 3.7 Å. The lattice parameter is :

asked Jul 26, 2018 by pady_1

1 answer

A roller coaster is designed such that riders experience "weightlessness" as they go round the top of a hill whose radius of curvature is 20m. The speed of the car at the top of the hill i between -

asked Jul 26, 2018 by pady_1

1 answer

In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is :- <img src""/>

asked Jul 26, 2018 by pady_1

1 answer

A tube of length L is filled completely with an incompressible liquid of mass M and closed at both the ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity ?. The force exerted by the liquid at the other ends is:-

asked Jul 25, 2018 by pady_1

2 answers

The displacement x of a particle varies with time$x=ae^{-\alpha t}+be^{\beta t}$, where $a,b,\alpha$ and $\beta$ are positive constants. The velocity of the particle will -

asked Jul 24, 2018 by pady_1

2 answers

A battery is charged at a potential of 15V for 8 hours when the current flowing is 10A. The battery on discharge supplies a current of 5A for 15 hours. The mean terminal voltage during discharges is 14 V. The "Watt hour" efficiency of the battery is :-

asked Jul 24, 2018 by pady_1

2 answers

The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of $^4_2He$ is (Given : helium nucleus mass ≈ 4.0015 u)

asked Jul 24, 2018 by pady_1

1 answer

Two bar magnets having same geometry with magnetic moments M and 2M, are firstly placed in such a way that their similer poles are same side then its time period of osccilation is $T_1$ . Now the polarity of one of the magnet is reversed then time period of osccilation is $T_2$ , then : -

asked Jul 23, 2018 by pady_1

0 answers

A photo-cell is illuminated by a source of light, which is placed at a distance d from the cell. If the distance become d/2, then number of electrons emited per second will be : -

asked Jul 20, 2018 by pady_1

1 answer

The cations and anions are arranged in alternate form in :

asked Jul 20, 2018 by pady_1

1 answer

Common emitter circuit is used as amplifier, its current gain is 50. If input resistance is 1 k$\Omega$ and input voltage is 5 volt then output current will be :

asked Jun 15, 2018 by pady_1

1 answer

A group of science students went on a field trip. They took 4 vans and 8 buses. There were 4 people in each van and 23 people in each bus. How many people went on the field trip?

asked Dec 31, 2015 by pady_1

1 answer

Devon is ordering breakfast in a restaurant. She can have over-easy, hard boiled, or poached eggs. On the side, she can choose to have toast, hash browns, or pancakes. How many different combinations can Devon order for breakfast?

asked Dec 31, 2015 by pady_1

0 answers

The area of a rectangular dining room is 35 square metres. It is 7 metres long. How wide is it?

asked Dec 31, 2015 by pady_1

0 answers

Simplify $(7\large\frac{1}{4} - 6 \large\frac{1}{4})$ of $(\large\frac{2}{5} + \large\frac{3}{15})$

asked Dec 31, 2015 by pady_1

0 answers

The area of a circle is increased by 22 cm^2 when its radius is increased by 1 cm. What is the original radius of the circle?

asked Dec 31, 2015 by pady_1

0 answers

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