Recent questions and answers in Units and Measurement

Find the dimension of physical quantity $X$ in the equation $Force=\large\frac{X}{Density}$

answered May 14, 2017 by muskaans095

2 answers

In the circuit as shown in the figure what is the potential difference between P and Q.

answered May 13, 2017 by nikunjjain285

1 answer

Six equal resistance are connected between point P,Q,R as shown in the fig. Then the net resistance will be maximum between

answered Feb 8, 2016 by meena.p

1 answer

A solenoid carrying a current supplied by a DC source with constant emf contains iron rod inside it. when the rod is pulled out of the solenoid , then the current in the solenoid will

answered Feb 8, 2016 by meena.p

1 answer

In an AC circuit V and I are given by $V=100 \sin (100 t) volt \; I =100 \sin (100 t +\large\frac{\pi}{3})amp$ the power dissipated in the circuit is

answered Feb 8, 2016 by meena.p

1 answer

An aeroplane is moving north horizontally , with a speed of $200 ms^{-1}$ ,at a place where the vertical component of the earth's magnetic field is $0.5 \times 10^{-4}\;T$ .What is the induced e.m.f set up between the tips of the wings, if they are 10 m apart ?

answered Feb 8, 2016 by meena.p

1 answer

If vectors $\overrightarrow{A} = \cos wt \hat i +\sin w + \hat j$ and $\overrightarrow{B} = \cos wt/2 \hat i +\sin wt/2 + \hat j$ are functions of time , then the value of t at which are orthogonal to each other is

answered Feb 8, 2016 by meena.p

1 answer

A child is standing with his two arms outstretched at the center of a turntable that is rotating about its central axis with an angular speed $w_0$ Now the child folds his hands back so that the moment of inertia becomes 3 times the intial values.The new angular speed is

answered Feb 8, 2016 by meena.p

1 answer

Three planets of same density and with radii $R_1,R_2$ and $R_3$ Such that $R_1=2R_2=3R_3$ , have gravitational fields on the surfaces $E_1,E_2,E_3$ and escape velocities $v_1,v_2,v_3$ respectively ,then

answered Feb 8, 2016 by meena.p

1 answer

A block of wood floats in water with $\large\frac{4}{5}$ th of its volume submerged , but it just floats in a liquid . What is the density of the liquid ?

answered Feb 8, 2016 by meena.p

1 answer

A clock with an iron pendulum beeps correct time at $15 ^{\circ}c$ what will be the error in time per day , if the room temperature is $20^{\circ}$ ?

answered Feb 8, 2016 by meena.p

1 answer

A charge q is placed at the centroid of an equilateral triangle. Three charges equal to Q are placed at the vertices of the triangle . The system of the four charges will be in equilibrium . if q is equal to

answered Feb 8, 2016 by meena.p

1 answer

Two H atoms in the ground state collide elastically. The maximum amount by which their combined kinetic energy reduced is

answered Feb 8, 2016 by meena.p

1 answer

The total energy in the ground state of hydrogen atom is $-13.6\;eV$ . The kinetic energy of this electron in first excited state is :

answered Feb 8, 2016 by meena.p

1 answer

Ina common emitter configuration, a transistor have $\beta= 50$ and input resistance $1k \omega$ . If the peak value of a.c input is $0.01\;V$ then the peak value of collector current is

answered Feb 8, 2016 by meena.p

1 answer

A ratio station has two channels . one is AM at $1020 kHz$ and the other FM at $89.5$ MHz. For good results you will use

answered Feb 8, 2016 by meena.p

1 answer

A ball is dropped to the ground from a height of 8 m. The coefficient of restitution is 0.5 . To what height will the ball rebound?

answered Feb 8, 2016 by meena.p

1 answer

An astronaut is looking down on Earth's surface from a space shuttle at an attitude of 400 km. Assuming that the assonants pupil diameter is 5 mm and wave length of visible light is 500 nm, the assonant will be able to resolve linear objects of the size of about

answered Feb 8, 2016 by meena.p

1 answer

The second overtone of an openpipe has the same frequency as the first overtone of a closed pipe 2m long . Calculate the length of the open pipe .

answered Feb 8, 2016 by meena.p

1 answer

A horizontal platform with an object placed on it is executing is $3.92 \times 10^{-3}$ what must least period of these oscillation , So that the object is not detached from the platform?

answered Feb 8, 2016 by meena.p

1 answer

A parallel plate capacitor c with plates of unit area and separation d is filled with a liquid of dielectric constant $k=2$ The level of the liquid is $\large\frac{d}{3}$ initially . Suppose the liquid level decreases at constant speed V, the time constant as a function of time t is

answered Feb 8, 2016 by meena.p

1 answer

The work done in turning a magnet of magnetic moment by an angle of $90^{\circ}$ from the meridian is n times the corresponding work done to turn it through an angle of $60^{\circ}$ . The value of n is given by

answered Feb 8, 2016 by meena.p

1 answer

A conductivity loop in the form of a circle is placed in a uniform magnetic field with its plane perpendicular to the direction of the field. An e.m.f will be included in the loop if

answered Feb 8, 2016 by meena.p

1 answer

An objects is located 4 m from the first of two thin covering lenses of focal length 2 m and respectively . The lenses are separated by 3 m. The final image formed by the second less is located from the source ata distance if :

answered Feb 8, 2016 by meena.p

1 answer

A Tv transmitting antenna is $128$ m tall. If the reactivating antenna is at the ground level, the maximum distance between them for satisfactory communication is LOS mode is (R of earth $=6.4 \times 10^6 m)$

answered Feb 8, 2016 by meena.p

1 answer

A person carrying a whistle entitling continuously a note of 272 Hz is running towards a reflecting surface with a speed of $18 km h^{-1}$ . The speed of sound in air is $345 ms^{-1}$ The number of beats heard by him is

answered Feb 8, 2016 by meena.p

1 answer

In the circuit shown in the fig the battery is ideal. A voltmeter of resistance $600 \Omega$ is connected in turn across $R_1$ and $R_2$ , giving reading $V_1$ and $V_2$ respectively . Then

answered Feb 8, 2016 by meena.p

1 answer

Two deuterium nuclei each of mass m, fuse together to form a helium nucleus , releasing an energy E. If C is the velocity of light , the mass of helium nucleus formed will be

answered Feb 8, 2016 by meena.p

1 answer

A boat which has a speed of $5\;kmh^{-1}$ in still water crosses a river of width 1 km along the shortest possible path in 15 mints . The velocity the river water in $kmh^{-1}$ is

answered Feb 8, 2016 by meena.p

1 answer

A resister of $500 \Omega$ an inductance of $0.5$ H are in series with an ac which is given by $v= 100 \sqrt 2 \sin (1000 t)$ . The passer factor of the combination is :

answered Feb 8, 2016 by meena.p

1 answer

The base current of transistor is $100 \mu A$ and the collector current is $2mA$ . What is the current gain for the common base configuration ?

answered Feb 8, 2016 by meena.p

1 answer

The moment of inertia of the system of four spheres about the side AD, when four solid spheres each of mass m and radius r are located with their centers on four corners of a square ABCD of slide a is :

answered Feb 8, 2016 by meena.p

1 answer

The type of isomerism found in vrea molecule is

answered Apr 15, 2015 by meena.p

1 answer

The time taken by a pendulum to complete 20 vibrations is $88.0$ second. The time period of the pendulum is

answered Aug 12, 2014 by meena.p

1 answer

A system takes $70.40 \;seconds$ to complete 20 oscillations. the time period of the system is :

answered Aug 12, 2014 by meena.p

1 answer

If the value of the resistance is $10.845 \Omega$ and the value of the current is $3.23$ ampere, then the potential difference is $35.02935$ volt. Its value in correct significant figures would be

answered Aug 12, 2014 by meena.p

1 answer

The mass of a box is $23\;g$ . Two gold pieces , each of mass $0.035\;g$ , are placed in it. The total mass of the box and gold pieces is

answered Aug 12, 2014 by meena.p

1 answer

A current of $2.34$ ampere flows in a resistance of $11.111111 \Omega$ The potential difference across the given resistance with due to regard for significant figures is

answered Aug 12, 2014 by meena.p

1 answer

The radius of a wire is $0.24 \;mm$ . Then its area of cross- section by taking significant figures into consideration is

answered Aug 12, 2014 by meena.p

1 answer

The length of a cube is $2.1 \times 10^{-2}\;m$ . The volume in significant figures will be

answered Aug 12, 2014 by meena.p

1 answer

There are atomic clocks capable of measuring time with an accuracy of 1 part in $10^{11}$ . If two such clocks are operated with precision , then after running for $5000\;year$ these will record.

answered Aug 12, 2014 by meena.p

1 answer

The effective length of a simple pendulum is the sum of the following three length of string , radius of bob, length of hook. In a simple pendulum experiment , the length of the string, as measured by a metre scale is $92.0\;cm$ . The radius of the bob combined with the length of the hook, as measured by a vernier callipers is $2.15\;cm$ The effective length of the pendulum is

answered Aug 12, 2014 by meena.p

1 answer

The dimensional method cannot be used to obtain the dependence of which of the following?

answered Jul 31, 2014 by balaji.thirumalai

1 answer

Find the value of $g$ (in $m\;s^{-2}$ ) up to approximate significant figures stating the uncertainty in the value of $g$ , given the following information:

answered Jul 12, 2014 by balaji.thirumalai

1 answer

In the following experiment, find the value of the density in g cm $^{-3}$ up to the appropriate significant figures, stating the uncertainty in the value of the density.

answered Jul 12, 2014 by balaji.thirumalai

1 answer

Find the total mass up to the appropriate significant figures of four objects that have the following masses: 1.54 Kg, 3.668 Kg, 5.1278 Kg and 2.5 Kg

answered Jul 12, 2014 by balaji.thirumalai

1 answer

What is the area of the cross section of the wire up to approximate significant figures if the radius of a uniform wire is 0.021 cms. The value of $\pi$ is given to be 3.142.

answered Jul 12, 2014 by balaji.thirumalai

1 answer

A man runs 100.5 m in 10.3 seconds. What is his average speed up to approximate significant figures?

answered Jul 12, 2014 by balaji.thirumalai

1 answer

A bee of mass 0.000087 Kg sits on a flower of mass 0.0123 Kg. What is the total mass supported by the stem of the flower up to the approximate significant figures?

answered Jul 12, 2014 by balaji.thirumalai

1 answer

The radius of sphere is measured to be $(2.1 \pm 0.5)$ cms. What is its surface area with error limits?

answered Jul 11, 2014 by balaji.thirumalai

1 answer

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