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What is the S.I. unit of relative density?

State two advantages and two disadvantages of friction.

Why is sliding friction less than static friction

A car is moving towards North. What will be the direction of force of friction acting on this car due to surface of road?

A beaker contains an acidified copper sulphate solution. A copper plate and a carbon rod are kept in this copper sulphate solution. The copper plate is connected to the positive terminal of a battery whereas the carbon rod is connected to the negative terminal of the battery. What will you observe when an electric current is passed through this set-up for a considerable time?

Is kgf the unit of upthrust and how?

Answer the following :

A. Name two factors on which the frictional forces depends.
B. Two chairs are being dragged, one empty while other is occupied. On which chair more frictional force is exerted?
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The magnitude of the maximum disturbance of the particles in the medium on either side of the mean position is called

Can we see light

A tester is made with the two terminals of a battery connected to separatewires, each with one end free. A light bulb is also a part of the circuit. Now an object is used to connect the free ends, and it is observed that the light bulb does not glow. (In other words, there is no electricity flowing) Which of the following could be that object?

Question:

A non-zero force is acting on a body but work done is zero. Which of the following statements justify the above situation?

1. Displacement is zero.
2. Force is perpendicular to the direction of displacement.
3. Force is parallel to displacement.
4. Force is opposite to the direction of displacement.

is option (a) true also?

What is Pascal denoted by

Identify the possessive noun from the sentence.

Manoj’s cribbing stopped once he was made in charge of the event.

What is the type of the underlined clause?

Do you remember the time when we had no electricity?

The diagram shown below explains that:

Which of the following is not a part of sound wave?

(a) What is the number of main stars in the Cassiopeia constellation? Draw a diagram of Cassiopeia constellation to show the position of main stars in it.

(b) What is the number of main stars in Leo Major constellation? Draw a diagram to show the position of main stars in Leo Major constellation.

Which of the following is incorrectly matched?

The coefficient of linear expansion of a cubical crystal along three mutually perpendicular directions is α₁ α₂ and α₃. What is the coefficient of cubical expansion of the crystal?

What type of reflection of light takes place from :

(a) a rough surface?

(b) a smooth surface?

A piece of iron of mass 0.2 kg is kept inside a furnace, till it attains the temperature of the furnace. The hot piece of iron is then dropped into a calorimeter containing 0.24 kg of water at 20 °C. The mixture attains an equilibrium temperature of 60 °C. The temperature of the furnace is

Which of the following cannot be accounted for atmospheric pressure?

Give reason

Aluminium foils are used to wrap food items

A train covers $54km$ in $10minutes$. Find the speed of the train?

What do you mean by the clockwise and anti-clockwise moment of force ?

In evaporation:

Select the correct alternative:

(a) when a glass rod is rubbed with the dry silk cloth, the charge acquired by the silk cloth is :

(i) positive

(ii) negative

(iii) both positive and negative

(iv) none of the above.

(b) When an ebonite rod is rubbed with fur,the rod acquires:

(i) positive charge

(ii) negative charge

(iii) no charge

(iv) none of the above.

(c) When a negatively charged body is brought closer to another negatively charged body, then they will show :

(i) attraction

(ii) no effect

(iii) repulsion

(iv) none of the above.

(d) Charging a conductor by bringing another charged conductor close to it without touching is called :

(i) induction (ii) conduction

(iii) convection (iv) radiation.

(e) The factor responsible for charging a conductor is :

(i) transfer of protons

(ii) transfer of neutrons

(iii) transfer of electrons

(iv) transfer of protons and electrons.

(f) Two objects when rubbed together get charged.The charges on them are:

(i) equal and opposite

(ii) equal and similar

(iii) unequal and similar

(iv) unequal and opposite

(g) When a glass rod is rubbed with silk,the glass rod and the silk get charged because:

(i) electrons are transferred from the silk to the glass rod

(ii) electrons are transferred from the glass rod to the silk.

(iii) protons are transferred from the silk to the glass rod.

(iv) protons are transferred from the glass rod to the silk.

(h) The conductor of electricity is :

(i) wood (ii) glass

(iii) ebonite (iv) human body

(i) A gold leaf electroscope is to be charged positively by conduction.For this:

(i) a positively charged rod is held close to near the disc of electroscope.

(ii) a positively charged rod is placed in contact with the disc of electroscope.

(iii) a negatively charged rod is held close to near the disc of electroscope.

(iv) a negatively charged rod is touched with the disc of electroscope.

(j) A glass rod rubbed with silk is touched with the disc of negatively charged gold leaf electroscope.The divergence of leaves will:

(i) decrease

(ii) increase

(iii) remain unchanged

(iv) first decreases and then increases.

(k) The rod in gold leaf electroscope is made up of:

(i) wood (ii) brass

(iii) glass (iv) ebonite

(l) Lighting conductor is made up of :

(i) copper (ii) glass

(iii) ebonite (iv) wood

Describe one activity to show the existence of atmospheric pressure.

Which type of pressure is experienced by a flying bird over its head?

Question 4

An astronaut standing on the surface of the moon throws a ball upwards. The ball would

(a) directly fall down from the point it is released.
(b) hang in space.
(c) go up and then come back to the surface of the moon.
(d) keep going up never to come back.

Which effect of current is responsible for electrolysis of salt solution?

Arrange solid, liquid, gas on the basis of intermolecular space between the particles in ascending order.

How does hails occurs?

How will you determine the density of irregular solids that are insoluble in water.

A sound source produce 40 compressions and 40 rarefactions in 0.4 seconds? What is the frequency?

1. 325