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Why is water spilled purposely on the slides in water parks? [2 MARKS]

For which of the following actions, non-contact forces cannot be held responsible?

The distances measured along the X-axis from the origin, to its right, are considered _____ and the distances measured along the X-axis from the origin, to its left are considered _____ by convention.

Calculate the area of a rectangle whose length and breadth are 12 cm and 8 cm respectively.

The contact forces of mechanics are fundamentally derived from

A simple pendulum is arranged using a small metallic bob of mass 'm'and a light rubber cord of length 'L' (on suspending the bob), area of cross section 'A' and Young's modulus 'Y'. [One should use inextensible cord only for simple pendulum!]. When this unconventional pendulum is at rest in its mean position, the bob is pulled slightly down and is released. Then, the period of the vertical oscillation of the bob is (assuming that the size of the bob is negligible compared to the length of the cord):

If an object is $3$ cm away from the plane mirror, what is the distance of the image formed from the mirror?

Name the characteristic of sound which depends on : (a) amplitude (b) frequency.

Choose the correct options regarding treading on tyres.

When the positive and negative charge on a body is left unbalanced, the body is

Why is it advised to cut off the power supply and switch off all electrical appliances at the time of a flood?

Can force be applied without an interaction between the objects? Explain with example.

Automobiles are fitted with silencers and soft horns:

The range of clinical thermometers is

With reference to conventional X- axis, negative displacement in 1-D motion implies that the particle is finally at a point which lies

What is a wavelength of a wave?

Can we create an artificial lightning?

Oxygen is slightly _________ than air hence it is collected by the _________ displacement of water.

Give two other names of Ursa Major constellation.

Name two objects other than planets which are members of the solar system. Which planet is called morning star?

Each name: 1 Mark

In order to protect against electrical shocks, _________is done in domestic circuits. It is a process of charge transfer from the metal case of an electrical appliance to the ground. This transfer of charges involves____________.

Two metal balls are suspended as shown in the figure. A glass rod is rubbed with silk to charge it. Now, touch both the balls with the glass rod. What is the observation that can be noted?

Question 4

Two charged objects are brought close to each other. What kind of interaction can be observed?

The displacement-time graph for a particle in a wave is shown below. Then the time period of the wave is

Why are the voices of men, women and children different?

Difference Between kinetic and potential energy with 10 example of each one

What is the objective of providing earthing in lightning conductors?

The magnetic needle deflects maximum when the liquid used is

why does ball bounce when we throw the ball on ground even when gravitational force is acting on it.

What measures can be taken to improve the quality of lives of the children with hearing impairment? [3 MARKS]

State whether the following statements are true or false :

(a) The pressure exerted by a liquid depends on the area of base of its container ?

(b) A drinking straw works on the pressure exerted by the liquid filled in a soft in a soft drink bottle in which it is placed.!

With the help of a labelled diagram, describe briefly how an iron key can be electroplated with copper.

Calculate the pressure at a depth of 50m below the surface of the sea. The density of sea water is 1024 $\frac{kg}{m^3}$.

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Question 1

Morning star is the name given to

(a) pole star
(b) planet Jupiter
(c) star Sirius
(d) planet Venus

1)What is limiting friction

The reflection in which parallel incident rays emrge non parallel from a surface is called as

Moon does not have light of its own. How are we able to see the Moon?