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Name the two groups in which various sources of energy are classified. State on what basis are they classified.

Describe a simple experiment to demonstrate the inertia of rest.

Generally what will be the audible range of Gaurav if he is 12 years old?

Which characteristic of a sound helps you to identify your friend by his voice while sitting with others in a dark room

A ship floats with ${\frac{1}{3}}^{rd}$ of its volume outside. when its in water. When it floats in another liquid, ${\frac{2}{3}}^{rd}$ of its volume is outside the liquid. What is the relative density of the liquid?

The blue colour of the sky is due to ____ of light.

The number of divisions between upper and lower fixed point in Fahrenheit scale is

An egg sinks in pure water, but it floats in salt water. Why?

The distance - time graph of a particle at time t makes an angle 45${}^{c}irc$ with time axis. After 1 second, it makes angle 60${}^{c}irc$ with time axis. What is the acceleration of the particle?

On the bombardment of ${}_7{N}^{14}$ with alpha particles, the nucleus of the product after the release of a proton will be

After holding a pack of ice in your hand for some time, you put your hand in water at room temperature. Your hand would now feel ___.

अपने घर पर कोई पुराना (या नया) पत्र ढूँढ़ो। उसे देखकर नीचे लिखे प्रश्नों का जवाब लिखो-

(क) पत्र किसने लिखा?

(ख) किसे लिखा?

(ग) किस तारीख को लिखा?

(घ) यह पत्र किस डाकखाने में तथा किस तारीख को पहुँचा?

(ङ) यह उत्तर तुम्हें कैसे पता चला?

1. 486

What is the importance of the universal law of Gravitation?

Question 1

Which of the following correctly describes the magnetic field near a long straight wire?

(a) The field consists of straight lines perpendicular to the wire.

(b) The field consists of straight lines parallel to the wire.

(c) The field consists of radial lines originating from the wire.

(d) The field consists of concentric circles centered on the wire.

Two point charges $Q_1$ and $Q_2$ placed at separation $d$ in vacuum and force acting between them is $F$. Now a dielectric slab of thickness $\frac{d}{2}$ and dielectric constant $K=4$ is placed between them. The new force between the charges will be

A perfectly elastic ball $P_1$ of mass m moving with velocity v collides elastically with three exactly similar balls $P_2,P_3,P_4$ lying on a smooth table as shown. Velocities of the four balls after the collision are

"...All
can hear, but only

The
sensitive can understand”

What
does the poet want to convey?

Question 11

Water level in a well was 20 m below ground level. During the rainy season, rainwater collected in different water tanks was drained into the well and the water level rises 5 m above the previous level. The wall of the well is 1 m 20 cm high and a pulley is fixed at a height of 80 cm. Raghu wants to draw water from the well. The minimum length of the rope, that he can use is


(a) 17 m
(b) 18 m
(c) 96 m
(d) 97 m

An inclined plane making an angle of ${30}^{\circ }$ with the horizontal is placed in a uniform horizontal electric field $200\text{N/C}$ as shown in the figure. A body of mass $1\text{kg}$ and charge $5\text{mC}$ is allowed to slide down from rest from a height of $1\text{m}$. If the coefficient of friction is $0.2$, find the time taken by the body to reach the bottom.



$[g=9.8{\text{m/s}}^2;\sin {30}^{\circ }=\frac{1}{2};\cos {30}^{\circ }=\frac{\sqrt{3}}{2}]$

A circular lamina is having uniform thickness and radius $a$. A hole of dimeter $a$ is cut out from it as shown in the diagram. The position of centre of mass, of the remining portion will be,

If a charge of $600C$ flows through the cross-section of a conducting wire in $5\text{minutes}$, what is the value of the current that flows through the wire?

1. 2

What happens when we fill a balloon with Helium gas?Support your answer with reasons.

A black body at a temperature of ${227}^0$C radiates heat energy at the rate of 5 cal/$c{m}^2$-sec. At a temperature of ${727}^0$C, the rate of heat radiated per unit area in cal/$c{m}^2$ will be

Q. अक्षांश रेखा के संदर्भ में, निम्नलिखित कथनों पर विचार कीजिए:

उपर्युक्त दिए गए कथनों में से कौन-सा/से कथन सही है/हैं?

A force of $12\text{N}$ produces an acceleration of $4{\text{m/s}}^2$ when it acts on a body $A$ and $6{\text{m/s}}^2$ when it acts on another body $B$. If the bodies $A$ and $B$ are tied together and a force of $10\text{N}$ is applied, what will be the acceleration?

A motorist accelerates from rest to a velocity of $90kmh{r}^{-1}$ in $15$ seconds. What is the average acceleration of the car?