Recent questions in Class11

Heat generated in a circuit is given by $H=I^2Rt$, $I$ is current $R$ is resistance, $t$ is time. If percentage error in measuring $I$, $R$ and $t$ are $2 \%,1\%$ and $1\%$ respectively. what is the maximum error in measuring heat

asked Jun 19, 2013 by meena.p

1 answer

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

asked Jun 19, 2013 by meena.p

2 answers

The following equation describe the motion of object where $x$ is displacement, $v,v_0$ are velocities, $m$ mass $V=Axe^{Bm}-\large\frac{c^2}{v^0}$. What must be the unit of $A$ and $B$?

asked Jun 18, 2013 by meena.p

1 answer

The kinetic energy of rotation k depends on angular momentum J and moment of inertia I.The expression for kinetic energy is ( where c is a constant )

asked Jun 18, 2013 by meena.p

1 answer

Curie is a unit of

asked Jun 18, 2013 by meena.p

1 answer

In an experiment the angles are measured using an instrument where $29$ divisions of main scale exactly coincide with $30$ division of vernier scale.If the smallest division in main scale is half a degree, then the least count of the instrument is

asked Jun 18, 2013 by meena.p

1 answer

The caesium clock are capable of measuring time with an accuracy of $1$ part in $10^{11}$. If two such clock run for $100$ years, find the difference in time shown by the clock

asked Jun 18, 2013 by meena.p

1 answer

The volume of a cube is $1.83 \;cm^3$. Find the volume of $25$ such identical cubes to correct number of significant figures.

asked Jun 18, 2013 by meena.p

1 answer

Dimensional analysis of equation (velocity)$^x$=(pressure difference)$^{\Large\frac{3}{2}}$(density)$^{\Large\frac{-3}{2}}$ give values of $x$ to be

asked Jun 18, 2013 by meena.p

1 answer

If pressure $P$, velocity $V$ and $T$ are taken as fundamental physical quantities the dimensional formula of force is

asked Jun 18, 2013 by meena.p

1 answer

Energy density and pressure have

asked Jun 18, 2013 by meena.p

1 answer

Of the following quantities which one has dimensions different from the remaining three ?

asked Jun 18, 2013 by meena.p

1 answer

The dimensions of $RC$ is same as that of

asked Jun 18, 2013 by meena.p

1 answer

$ML^{-1}T^{-2}$ represents

asked Jun 18, 2013 by meena.p

1 answer

If $h$ - is plank constant,e charge then dimension of ohm is same as

asked Jun 18, 2013 by meena.p

1 answer

If $m$ is mass, $'Q'$ is charge and $B$ is magnetic induction $\large\frac{m}{BQ}$ has same dimension as

asked Jun 18, 2013 by meena.p

1 answer

If fundamental units of mass, length and time are each doubled, what happens to unit of energy

asked Jun 18, 2013 by meena.p

1 answer

A gas bubble from under water explosion oscillates with time period $T$ propotional to $P^xd^yE^z$ where $P$-pressure, $d$-density, $E$-energy, values of $x,y,z$ are

asked Jun 18, 2013 by meena.p

1 answer

Dimensional formula for electrical resistivity

asked Jun 18, 2013 by meena.p

1 answer

When a copper sphere is heated maximum percentage change will be observed in

asked Jun 18, 2013 by meena.p

1 answer

The physical quantity not having the same dimensions are

asked Jun 17, 2013 by meena.p

1 answer

Dimensionless quantity

asked Jun 17, 2013 by meena.p

1 answer

The dimensions of $RC$, where $R$ is resistence and $C$ is capacitance are same as that of

asked Jun 17, 2013 by meena.p

1 answer

The dimensions of $CV^2$ match with the dimensions of

asked Jun 17, 2013 by meena.p

1 answer

Dimensional formula for the product of two physical quantities $P$ and $Q$ is $ ML^2T^{-2}$. The dimensional formula for $\large \frac{P}{Q}$ is $ML^0T^{-2}$. $P$ and $Q$ are

asked Jun 17, 2013 by meena.p

1 answer

Dimensional formula for $\large\frac{L}{RCV}$ is

asked Jun 17, 2013 by meena.p

1 answer

Pick the odd one out -

asked Jun 17, 2013 by meena.p

1 answer

The quantity represented by $\large\frac{\text{mass} \times \text{pressure}}{\text{density}}$ is

asked Jun 17, 2013 by meena.p

1 answer

An athletic coach told his team that muscle times speed is equal to power. What dimension does he view for muscle ?

asked Jun 17, 2013 by meena.p

1 answer

The initial and final temperature of a liquid in a container are observe to be $76.3 \pm0.5 ^{\circ} c$ and $27.7 \pm 0.2 ^{\circ} c$. Find the fall in temperature.

asked Jun 17, 2013 by meena.p

1 answer

Volt is equivalent to

asked Jun 17, 2013 by meena.p

1 answer

The value of Kinetic energy $K$ and potential energy $V$ are measured as follows $K=100.0 \pm 2.0\; I \quad V=200.0 \pm 1.0\; I$. What is the percentage error in measurement of mechanical energy ?

asked Jun 17, 2013 by meena.p

1 answer

Find the value of $\large\frac{1.53 \times 0.9995}{1.592}$ with regards for 3 significant figures.

asked Jun 17, 2013 by meena.p

1 answer

If the equation $y=A \cos (Bx-Ct)$ describe the motion of objects ( where $x$ and $y$ are displacements, $t$ is time ), what must be the units of variables $A,B$ and $C$ ?

asked Jun 17, 2013 by meena.p

1 answer

Suppose we are told that the acceleration $A$ of a particle moving with uniform speed $v$ in a circle of radius $r$ is proportional to some power of r, say $r^n$, and some power of v, say $v^m$. Which of the following is the simplest form of an equation for the acceleration?

asked Jun 17, 2013 by meena.p

1 answer

The position $x$ of a particle at time $t$ is given by $x=\large\frac{v_0}{a} $$(1-e^{-at})$ where $v_0$ is constant and $a >0$ find the dimensions of $v_0$ and $a$

asked Jun 17, 2013 by meena.p

1 answer

Two resistances are expressed as $R_1=(4\pm0.5) \Omega$ and $R_2=(12 \pm 0.5) \Omega$. what is the net resistance when they are connected 1) series 2) in parallel, with percentage error ?

asked Jun 17, 2013 by meena.p

1 answer

$\mu$ and $\in _0$ denote the permeability and permitting of free space, the dimensions of $\mu_0\in _0$ are

asked Jun 17, 2013 by meena.p

1 answer

The unit of L / R is (L=inductance and R=resistance)

asked Jun 17, 2013 by meena.p

1 answer

In a certain system, $1$ unit of time is $5\;sec,$ 1 unit of mass is $20 \;kg$ and 1 unit of length is $10 m$. In this system $1$ unit of power corresponds to

asked Jun 16, 2013 by meena.p

1 answer

$E,m,J$ and $ G$ denote energy,mass angular momentum and gravitational constant respectively then the dimension of $\large\frac{EJ^2}{m^5G^2}$ are

asked Jun 16, 2013 by meena.p

1 answer

Identify the pair whose dimensions are equal

asked Jun 16, 2013 by meena.p

1 answer

If force, acceleration and time are taken as fundamental qualities, then the dimension of length will be

asked Jun 15, 2013 by meena.p

1 answer

If $C$ is capacity and $V$ is the potential across the condenser, what will be the dimensional representation of $\large\frac{1}{2}$$CV^2$

asked Jun 15, 2013 by meena.p

1 answer

The equation of state of some gases can be expressed as $ \bigg(p+\large\frac{a}{v^2}\bigg)$$(v-b)=RT$ Here $p$ is pressure, $v$ is volume , $a,b,R$ are constants. The dimensions of $ 'a'$ are

asked Jun 13, 2013 by meena.p

1 answer

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