Recent questions tagged 11

Among the following, the narrow spectrum antibiotic is

asked Jul 8, 2019 by pady_1

1 answer

A stone tied to a string is rotated in a vertical circle. The minimum speed with which the string has to be rotated :

asked Dec 19, 2018 by pady_1

0 answers

A ball A moving with a speed of $99\;ms^{-1}$ collides directly with another identical ball B moving with a speed $v$ in the opposite direction, A comes to rest after the collision. If the coefficients of restitution is 0.8, the speed of B before collision, is :

asked Dec 19, 2018 by pady_1

1 answer

An ammeter and a voltmeter of resistance $R$ are connected in series to an electric cell of negligible internal resistance. Their readings are A and V respectively. If another resistance $R$ is connected in parallel with voltmeter :

asked Dec 19, 2018 by pady_1

0 answers

When a glass prism of refracting angle $60^{\circ}$ is immersed in a liquid its angle of minimum deviation is $30^{\circ}$. The critical angle of glass with respect to the liquid medium is :

asked Dec 11, 2018 by pady_1

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Tube A has both ends open while tube B has one end closed, otherwise they are identical. The raio of fundamental frequency of tubes A and B is :

asked Dec 11, 2018 by pady_1

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The thermo-emf of a thermocouple is $25 \; \mu V/^{\circ}C$ at room temperature. A galvanometer of $40 \Omega$ resistance, capable of detecting current as low as $10^{-5}A$, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is :

asked Dec 11, 2018 by pady_1

0 answers

An electron, a proton and an alpha particle having the same kinetic energy are moving in circular orbits of radii $r_e, r_p, r_{\alpha}$ respectively in unifrom magnetic field B. The relation between $r_e, \; r_p, \; r_\alpha$ is :

asked Dec 11, 2018 by pady_1

0 answers

If $(2+\sin x) \frac{dy}{dx} +(y+1) \cos x = 0$ and $y(0)=1$, then $y(\frac{\pi}{2})$ is equal to :

asked Dec 11, 2018 by pady_1

1 answer

A uniform string of length 20 m is suspended from a rigid support. A short wave pulse is introduced at its lowest end. It starts moving up the string. The time taken to reach the support is : (take $g = 10\; ms^{−2}$ )

asked Dec 11, 2018 by pady_1

0 answers

In an ideal gas at temperature $T$, the average force that a molecule applies on the walls of a closed container depends on $T$ as $T^q$ . A good estimate for $q$ is :

asked Dec 11, 2018 by pady_1

0 answers

A particle moves with simple harmonic motion in a straight line. In first $\tau$ s, after starting from rest it travels a distance a, and in next $\tau$ s it travels 2a, in same direction, then :

asked Dec 11, 2018 by pady_1

0 answers

Which of the following arrangements does not represent the correct order of the property stated against it ?

asked Dec 11, 2018 by pady_1

0 answers

In a $\Delta PQR$, if $ 3 \sin P + 4 \cos Q = 6 $ and $4 \sin Q + 3 \cos P = 1$, then the angle R is equal to

asked Dec 11, 2018 by pady_1

1 answer

A fully charged capacitor C with initial charge $q_0$ is connected to a coil of self inductance $L$ at $t=0$. The time at which the energy is stored equally between the electric and the magnetic field is :

asked Dec 11, 2018 by pady_1

0 answers

The energy required to break one mole of Cl–Cl bonds in $Cl_2$ is $242 \;kJ\; mol^{–1}$. The longest wavelength of light capable of breaking a single $Cl – Cl$ bond is $(c = 3 x 10^8 ms^{–1} \;and\; NA = 6.02 \times 10^{23} mol^{–1})$

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. <br> Statement-1 : The temperature dependence of resistance is usually given as $R = R_o(1+ \alpha \Delta t)$. The resistance of a wire changes from $100 \Omega$ to $150 \Omega$ when its temperature is increased from $27^{\circ}C$ to $227^{\circ}C$. This implies that $\alpha = 2.5 \times 10^{-3} /^{\circ} C$. <br> Statement 2 : $R = R_i (1 + \alpha \Delta T)$ is valid only when the change in the temperature $\Delta T$ is small and $\Delta R= (R-R_o) < < R_o$.

asked Nov 29, 2018 by pady_1

0 answers

The solution of the differential equation $\frac{dy}{dx}=\frac{x+y}{x}$ satisfying the condition y (1) = 1 is

asked Nov 29, 2018 by pady_1

0 answers

If $p$ and $q$ are positive real numbers such that $p^2 + q^2 = 1$, then the maximum value of $(p + q)$ is :

asked Nov 29, 2018 by pady_1

0 answers

The maximum velocity of a particle, executing simple harmonic motion with an amplitude 7 mm, is 4.4 m/s. The period of oscillation is :

asked Nov 13, 2018 by pady_1

0 answers

If the coefficients of $r^{th}$, $(r+1)^{th}$ and $(r+2)^{th}$ terms in the binomial expansion of $(1 + y)^m$ are in AP, then $m$ and $r$ satisfy the equation :

asked Nov 5, 2018 by pady_1

0 answers

A block is kept on a frictionless inclined surface with angle of inclination $\propto$. The incline is given an acceleration $a$ to keep the block stationary. Then $a$ is equal to : <br>

asked Nov 5, 2018 by pady_1

0 answers

Let $S(K) = 1 + 3 + 5 + ....+ (2K-1) = 3 + K^2$. Then which of the following is true ?

asked Nov 5, 2018 by pady_1

0 answers

An inductor 20 mH, a capacitor $100 \; \mu F$ and a resistor $50 \Omega$ are connected in series across a source of emf, $V = 10 \sin 314 \;t$. The power loss in the circuit is

asked Aug 21, 2018 by pady_1

1 answer

Identify A and predict the type of reaction <br>

asked Aug 21, 2018 by pady_1

1 answer

Which one of the following characteristics is associated with adsorption ?

asked Aug 21, 2018 by pady_1

1 answer

Decreasing order of stability of $O_2, O_2^-, O_2^+$ and $O_2^{2-}$ is :

asked Aug 21, 2018 by pady_1

1 answer

A block hole is an object whose gravitational field is so strong that even light cannot escape from it. To what approximate radius would earth (mass = $5.98 \times 10^{24}\; kg$) have to be compressed to be a black hole ?

asked Aug 20, 2018 by pady_1

1 answer

Infinite number of bodies, each of mass 2 kg are situated on x-axis at distances 1m, 2m, 4m, 8m, … , respectively, from the origin. The resulting gravitational potential due to this system at the origin will be -

asked Aug 20, 2018 by pady_1

1 answer

When a mass is rotating in a plane about a fixed point, its angular momentum is directed along

asked Aug 20, 2018 by pady_1

1 answer

The potential energy of a system increases if work is done :

asked Aug 16, 2018 by pady_1

1 answer

A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conducts a amount of heat Q in time t. The metallic rod is melted and the material is formed into a rod of half the radius of the original rod. What is the amount of heat conducted by the new rod, when placed in thermal contact with the two reservoirs in time t ?

asked Jul 26, 2018 by pady_1

1 answer

If $\overrightarrow{F}$ is the force acting on a particle having position vector $\overrightarrow{r}$and $\overrightarrow{\tau}$ be the torque of this force about the origin, then :

asked Jul 26, 2018 by pady_1

1 answer

A particle shows distance-time curve as given in this figure. The maximum instantaneous velocity of the particle is around the point :

asked Jul 26, 2018 by pady_1

1 answer

A particle of mass $m$ moves in the XY plane with a velocity v along the straight line $AB$. If the angular momentum of the particle with respect to origin $O$ is $L_A$ when it is at $A$ and $L_B$ when it is at $B$, then : <img src =""/>

asked Jul 26, 2018 by pady_1

1 answer

In a radioactive material the activity at time $t_1$ is $R_1$ and at a later time $t_2$, it is$R_1$. If the decay constant of the material is $\lambda$, then

asked Jul 25, 2018 by pady_1

1 answer

If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by $\mu_d$, $\mu_p$ and $\mu_f$ respectively, then

asked Jul 24, 2018 by pady_1

0 answers

A beam of light composed of red and green rays is incident obliquely at a point on the face of a rectangular glass slab. When coming out on the opposite parallel face, the red and green rays emerge from :-

asked Jul 24, 2018 by pady_1

2 answers

The vector sum of two forces is perpendicular to their vector differences. In that case, the forces :

asked Jul 24, 2018 by pady_1

1 answer

What is the cause of “Green house effect” : -

asked Jul 23, 2018 by pady_1

1 answer

Biological importance of Ozone layer is : -

asked Jul 20, 2018 by pady_1

1 answer

Rainbow is formed due to :

asked Jul 20, 2018 by pady_1

1 answer

Half life period of two elements are 40 minute and 20 minute respectively, then after 80 minute ratio of the remaining nuclei will be (Initially both have equal active nuclei) :

asked Jun 15, 2018 by pady_1

1 answer

If it is possible to from a word with the first, fourth, seventh and eleventh letters in the word 'SPHERVLVODS' write the second letter of thet word. Otherwise, X is the answer.?

asked Dec 31, 2015 by pady_1

1 answer

Which type of graph would best show the number of films each third-grade student watched last year?

asked Dec 31, 2015 by pady_1

1 answer

Joel's aunt lives 156 kilometers away from his house. When he wants to visit his aunt, he travels \large\frac{6}{13} of this distance by train and the rest by bus. How many kilometers does he travels by bus?

asked Dec 31, 2015 by pady_1

0 answers

$\large\frac{212}{8} \div 4$

asked Dec 31, 2015 by pady_1

0 answers

Paul earns $ 24000 per month. He saves 28\% of his salary. How much does he spend every month?

asked Dec 31, 2015 by pady_1

1 answer

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