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Which of the following is the most suitable standard for measurement of length?

Match the following and justify your answer. [5 MARKS]

$\begin{array}{cc}\text{Process}& \text{Effect}\\ \text{Evaporation}& \text{Formation of clouds}\\ \text{Infiltration}& \text{Conservation of water}\\ \text{Condensation}& \text{Generation of water vapour}\\ \text{Drip irrigation}& \text{Transfer of water from the atmosphere to land}\\ \text{Precipitation}& \text{Recharging of groundwater}\end{array}$

A cube of side 10cm is filled with ice of density 0.9gm/cc. Thickness of the walls of the cube is 1mm and thermal conductivity of the material of cube is 0.01CGS units. If the cube is placed in steam bath maintained at temperature of 100^oC, then the time in which ice completely melts?(latent heat of fusion of ice = 80 cal/gm)

Why do telephone wires sag in summer?

Question 15

A spaceship travels 36,000 km in one hour. Express its speed in km/s

What happens when a liquid becomes gas?

A hot and a cold body are kept in vacuum separated from each other. Which of the following cause decrease in temperature of the hot body

A rubber sucker as shown above, when pressed on a surface sticks to it, because:

Which among following pairs of newspaper/journal and their founder/editor correctly matched:-

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In which of the following pairs is the first person sitting to the immediate left of the second person?

___ is a rotary mechanical device that takes energy from a flowing fluid and converts it into useful work.

Which of the following safety measures should be followed during thunderstorms?

Bob of a pendulum refers to

The area of the given figure will be___sq. units.

Choose the correct options: The equation (m being real), $m{x}^2+2x+m=0$ has two distinct roots if _____

Which of the following use/s an electric cell for working?

The device which measures electric current is called ___

Which all of the following are true about liquid pressure?

Question 17

Your teacher has shown you the following activity

Activity: Teacher has wound a long insulated piece of wire around an iron nail in the form of a coil. Free ends of the wire are connected to a cell through a switch as shown in the Figure 14.3. The current is switched on and some pins are placed near the ends of the nail.

Write down any three questions that come to your mind about this activity

A child staying in a coastal region uses his tester (consisting of a magnetic needle) with drinking water and sea water. He observes that

What do you mean by heat? How is it measured? Which thermometer is used for measuring the human body temperature and how is it different? [5 MARKS]

Question 8 (b)
The combination of two or more cells is called a ___.

What side of a convex mirror should be silvered -- inner or outer?

We can change the strength of electromagnets by changing the amount of electricity which is passing through them. Now, answer the following question: The electromagnets are ___________

The coefficient of thermal conductivity depends upon

A ball falling in a lake of depth 200 m shows 0.1% decrease in its volume at the bottom. What is the bulk modulus of the material of the ball

The splitting of white light into seven colours is known as ___.

Rohan covers a distance of 10 km by running with a uniform speed of 4.5 km/hr. Sohan runs 1.2 km in 15 minutes. Who runs faster?

In the given figure, a ray OA is incident upon a smooth surface POQ. It is reflected back along OB. A normal ON is drawn perpendicular to the surface at O (the point of incidence). The value of $\angle AOP$ is ${60}^{\circ }$ . Find the value of the angle of reflection.

Which of the following correctly represents a battery?

1. Zero Velocity
2. Constant Speed
3. Constant Acceleration
4. Uniform Velocity

For the below figure, find the total voltage when the batteries are connected in series.

The length of a rectangle is twice the width of it. If perimeter of the rectangle is 42 m, find the area of the rectangle.

To and fro motion of an object is also known as :

A person moves away from a mirror at a constant speed of $5m{s}^{-1}$. At what speed would his image move with respect to the mirror?

During heavy rainfall and storms, thatched roofs over mud houses get blown away. What is the reason for this?

State two factors on which the kinetic energy of a moving body depends

Electricity is which type of state.

Why the thermometer is always kept under the tongue?

The Velcro is used for

How long does it take, in seconds, for a 160 m long train to enter a tunnel when the train is travelling at 170 km/h?

____ is used to protect tall buildings from damage?