Recent questions tagged 1

Under isothermal condition, a gas at 300 K expands from 0.1L to 0.25L against a constant external pressure of 2 bar. The work done by the gas is :- [Given that 1L bar = 100 J]

asked Jul 8, 2019 by pady_1

1 answer

An iron block of sides $50\; cm \times 8 \; cm \times 15\; cm $ has to be pushed along the floor. The force required will be minimum when the surface in contact with ground is :

asked Dec 19, 2018 by pady_1

0 answers

Two particles of mass 1 kg and 3 kg have position vectors $2 \hat{i} + 3\hat{j} + 4 \hat{k}$ and $-2 \hat{i} + 3 \hat{j} - 4 \hat{k}$ respectively.

asked Dec 19, 2018 by pady_1

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Two long parallel copper wires carrying currents in the opposite directions of 5 A each. If the wires are separated by a distance of $0.5\;m$, then the force per unit length between the two wires is :

asked Dec 19, 2018 by pady_1

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A nichrome wire $50\; cm$ long and $1 \; mm^2$ cross-section carries a current of $4\;A$. When connected to $2$ volt battery. The resistivity of nichrome with in $\Omega^{-m}$ is :

asked Dec 11, 2018 by pady_1

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The inductance between A and D is :

asked Dec 11, 2018 by pady_1

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A particle of mass $M$ and charge $Q$ moving with velocity $\overrightarrow{v}$ describes a circular path of radius $R$ when subjected to a uniform transverse magnetic field of induction $B$. The work done by the field when the particle completes one full circle is :

asked Dec 11, 2018 by pady_1

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It is found that if a neutron suffers an elastic collinear collision with deuterium at rest, fractional loss of its energy is $p_d$, while for its similar collision with carbon nucleus at rest, fractional loss of energy is $p_c$. The values of $p_d$ and $p_c$ are respectively :

asked Dec 11, 2018 by pady_1

0 answers

If S is the set of distinct values of 'b' for which of the following system of linear equations $x + y + z = 1$ $x + ay + z = 1$ $ax + by + z = 0$ has no solution, then S is :

asked Dec 11, 2018 by pady_1

1 answer

A student measures the time period of 100 oscillations of a simple pendulum four times. The data set is 90 s, 91 s, 95 s and 92 s. If the minimum division in the measuring clock is 1 s, then the reported mean time should be :

asked Dec 11, 2018 by pady_1

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$x$ and $y$ displacements of a particle are given as $x(t) = a \sin \omega t$ and $y(t) = a \sin 2 \omega t$. Its trajectory will look like :

asked Dec 11, 2018 by pady_1

0 answers

The pressure that has to be applied to the ends of a steel wire of length 10 cm to keep its length constant when its temperature is raised by $100^{\circ}C$ is : (For steel Young’s modulus is $2 \times 10^{11} N m^{–2}$ and coefficient of thermal expansion is $1.1 \times 10^{–5} K^{–1}$ )

asked Dec 11, 2018 by pady_1

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An unknown alcohol is treated with the "Lucas reagent" to determine the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism :

asked Dec 11, 2018 by pady_1

0 answers

The equation $e^{\sin x }- e^{- \sin x} - 4 = 0 $ has

asked Dec 11, 2018 by pady_1

1 answer

The transverse displacement $y(x,t)$ of a wave on a string is given by $y (x,t) = e^{-(ax^2 + bx^2 + 2 \sqrt{ab}\; xt)}$. This represents a

asked Dec 11, 2018 by pady_1

0 answers

The standard enthalpy of formation of $NH_3$ is $–46.0\; kJ mol^{–1}.$ If the enthalpy of formation of $H_2$ from its atoms is $–436\; kJ mol^{–1}$ and that of $N_2$ is $–712\; kJ mol^{–1},$ the average bond enthalpy of $N–H$ bond in $NH_3$ is

asked Dec 11, 2018 by pady_1

0 answers

This question contains Statement - 1 and Statement - 2. Of the four choices given after the statements, choose the one that best describes the two statements. Statement - 1 : For a charged particle moving from point P to point Q, the net work done by an electrostatic field on the particle is independent of the path connecting point P to point Q. Statement -2 : The net work done by a conservative force on an object moving along a closed loop is zero.

asked Nov 29, 2018 by pady_1

0 answers

AB is a vertical pole with B at the ground level and A at the top. A man finds that the angle of elevation of the point A from a certain point C on the ground is $60^\circ$. He moves away from the pole along the line BC to a point D such that CD = 7 m. From D the angle of elevation of the point A is $45^\circ$. Then the height of the pole is

asked Nov 29, 2018 by pady_1

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In a geometric progression consisting of positive terms, each term equals the sum of the next two terms. Then the common ratio of this progression equals :

asked Nov 29, 2018 by pady_1

0 answers

The Kirchhoff's first law $(\sum i =0)$ and second law $(\sum i R = \sum E)$, where the symbols have their usual meanings, are respectively based on :

asked Nov 13, 2018 by pady_1

0 answers

If $C$ is the mid point of AB and P is any point outside AB, then :

asked Nov 5, 2018 by pady_1

0 answers

A projectile can have the same range R for two angles of projection. If $t_1$ and $t_2$ be the times of flights in the two cases, then the product of the two times of flights is proportional to :

asked Nov 5, 2018 by pady_1

0 answers

Let $R = \{ (1,3), (4,2), (2,4), (2,3), (3,1) \}$ be a relation on the set $A = \{1, 2, 3, 4\}$. The relation R is

asked Nov 5, 2018 by pady_1

0 answers

The effciency of an ideal heat engine workong between the freezing point and boiling point of water, is

asked Aug 21, 2018 by pady_1

1 answer

The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is :

asked Aug 21, 2018 by pady_1

1 answer

The addition of a catalyst during a chemical reaction alters which of the following quantities ?

asked Aug 21, 2018 by pady_1

2 answers

2,3-Dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid?

asked Aug 21, 2018 by pady_1

1 answer

If force (F), velocity(V) and time (T) are taken as fundamental units, the dimensions of mass are

asked Aug 20, 2018 by pady_1

1 answer

In an experiment four quantities a, b, c and d are measured with percentage error 1%, 2%, 3% and 4% respectively. Quantity P is calculated as follows : $P = \frac{a^3b^2}{cd} . \%$ error in P is :

asked Aug 20, 2018 by pady_1

1 answer

The damping force on a oscillator is directly proportional to the velocity. The Unit of the constant of proportionality are

asked Aug 20, 2018 by pady_1

1 answer

The dimension of $(\mu_o \epsilon_o)^{-1/2}$ are :

asked Aug 16, 2018 by pady_1

1 answer

A block of mass m is in contact with the cart C as shown in figure :– The coefficient of static friction between the block and the cart is $\mu$. The acceleration $\alpha$ of the cart that will prevent the block from falling satisfies –

asked Jul 26, 2018 by pady_1

1 answer

If the dimensions of a physical quantity are given by $[M^aL^bT^c]$, then the physical quantity will be:

asked Jul 26, 2018 by pady_1

1 answer

A particle of mass m is projected with velocity v making an angle of $45^o$ with the horizontal from level ground. When the particle lands on the level ground the magnitude of the change in its momentum will be -

asked Jul 26, 2018 by pady_1

1 answer

Dimensions of resistance in an electrical circuit, in terms of dimension of mass M, of length L, of time T and of current I, would be:-

asked Jul 26, 2018 by pady_1

1 answer

In producing chlorine through electrolysis 100 watt power at 125V is being consumed. How much chlorine per minute is liberated ? E.C.E. of chlorine is $0.367\times 10^{–6}$ kg/coulomb:-

asked Jul 25, 2018 by pady_1

1 answer

The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5eV. According to Einstein's equation, the metals which will emit photo electrons for a radiation of wavelength $4100 A^{\circ}$ is/are-

asked Jul 24, 2018 by pady_1

1 answer

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be :-

asked Jul 24, 2018 by pady_1

1 answer

If a ball is thrown vertically upwards with speed u, the distance covered during the last ‘t’ seconds of its ascent is :

asked Jul 24, 2018 by pady_1

1 answer

A mass is suspended separately by two different springs in successive order then time period is $t_1$ and $t_2$ respectively. If it is connected by both spring as shown in figure then time period is $t_0$, the correct relation is :

asked Jul 23, 2018 by pady_1

1 answer

The dimension of Planck constant equals to that of :

asked Jul 20, 2018 by pady_1

1 answer

Two masses as shown are suspended from a massless pulley. Calculate the acceleration of the system when masses are left free :

asked Jul 20, 2018 by pady_1

1 answer

Boron has two isotopes $_5B^{10}$ and $_5B^{11}$. If atomic weight of Boron is 10.81 then ratio of $_5B^{10}$ to $_5B^{11}$ in nature will be :

asked Jun 15, 2018 by pady_1

2 answers

How many lines of symmetry does a rectangle have?

asked Dec 31, 2015 by pady_1

1 answer

Find the area of a rectangle of length 17 cm and breadth 9 cm.

asked Dec 31, 2015 by pady_1

0 answers

Shweta's aunt lives 190 kilometers away from her house. When she wants to visit her aunt, she travels $\large\frac{7}{19}$ of this distance by train and the rest by bus. How many kilometers does she travels by bus?

asked Dec 31, 2015 by pady_1

0 answers

If 19 Kgs. of rice is required to make food for 437 people, then how many kilograms will be needed to make food for 1196 people?

asked Dec 31, 2015 by pady_1

1 answer

Identify the quantifier and write the negation of the statement "There exists a number which is equal to its square."

asked Jul 16, 2014 by rvidyagovindarajan_1

1 answer

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