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Noor writes four components of the solar system in the order as: Earth, Mars, Asteroid, Saturn. The components have been written in this order on the basis of

Name two factors on which the pressure on a surface depends.

Which among the following is not a fundamental force of nature?

Laws of reflection states:

A wooden block of mass 10 g is dropped from the top of a cliff 100 m high. Simultaneously, a bullet of mass 10 g is fired from the foot of the cliff upward with a velocity of $100m{s}^{-1}$. At what time will the bullet and the block meet ? Take g= $9.8m{s}^{-2}$.

If current is passed through the solution of an electrolyte:

The volume of a plastic covered sealed box is 350cm³ and the box has a mass of 500 g. Will the box float on water or sink in water? What will be the mass of water displaced by the box?

Name the device which is attached to heavy luggage (such as a heavy suitcase) to move it easily by pulling.

Name the planet (a) nearest to the Sun, and (b) farthest from the Sun.

What is force? How do two bodies exert force on each other?

Question 3(c)

State whether the following statement is true or false.
​​​​​​​Lightning conductor cannot protect a building from lightning.

A shell following a parabolic path explodes somewhere in its flight. The centre of mass of fragments will continue to move in

(a) S.I. unit of moment of force is :

(i) N (ii) N cm (iii) kgf m (iv) N m

(b) To obtain a given moment of force for turning a body, the force needed can be decreased by :

(i) applying the force at the pivoted point (ii) applying the force very close to the pivoted point

(iii) applying the force farthest from the pivoted point. (iv) none of the above.

(c) The unit of thrust is :

(i) kgf (ii) kg (iii) g (iv) $m{s}^{-1}$

(d) The unit of pressure is :

(i) $N\times m$ (ii) kgf (iii) $N{m}^{-2}$ (iv) $kgf{m}^2$

(e) Thr pressure and thrust are related as :

(i) Pressure = Thrust (ii) Pressure = Thrust $\times$ Area

(iii) Pressure = Thrust / Area (iv) Pressure = Area / Thrust

(f) A body weighing 5 kgf, placed on a surface of area 0.1 $m^2$, exerts a thrust on the surface equal to :

(g) The feet of lizards act like :

(i) moving pads (ii) drilling pads (iii) suction pads (iv) none of the above

(h) The pressure exerted by a liquid is due to its :

(i) weight (ii) mass (iii) volume (iv) area

(i) The pressure inside a liquid increases with :

(i) increase in depth (ii) decrease in depth (iii) decrease in density (iv) none of the above

(j) The atmospheric pressure at sea level is nearly:

(i) 10 Pa (ii) 100,000 Pa (iii) 100 Pa (iv) 10,000 Pa

(k) Nose bleeding may occur at a high altitude because :

(i) the atmospheric pressure decreases (ii) the oxygen content of the atmosphere decreases

(iii) the atmospheric pressure increases (iv) there are strong air currents at the high altitude

What is the nature of force between two unlike magnetic poles?

A glass rod is rubbed with silk. State the kind of charge acquired by each.

Explain the statement "the relative density of copper is 8.4"

How does a drinking straw works on atmospheric pressure?

Give some important features of the moon.

P, Q, R, and S are four media. They are arranged according to the speed of light in them as:
Q>P>S>R
Which medium has the least optical density?

Give reasons:-

a) a one centimetre cube block of wood weighs lesser than a one centimetre cube block of iron

Explain why do we find difficult to walk on sand but camel's walk easily on the basis of force and area covered by their feet? 50-70words

Is force required to keep a object moving?

Two uniformly charged spheres with radii $r_1$ & $r_2$ and charges $Q_1$ & $Q_2$ are separated by distance d (from the periphery of the two spheres). What is the magnitude of force on $Q_2$ due to $Q_1$?

Which is earth's nearest planetary neighbour?

(a) What is the upper limit of frequency of human hearing ?

(b) What is the lower limit of frequency of human hearing ?

(c) Name one animal which can produce ultrasonic sounds.

(d) Name two animals which can hear ultrasonic sounds.

The given figure shows the location of a star with respect to the constellation. Which star is illustrated in the given figure?

It is difficult to drive a vehicle whose tyre is not properly inflated because

On heating a liquid of coefficient of cubical expansion g in a container having coefficient of linear expansion g/ 3, the level of liquid in the container will

A rectangular tank of depth 8 m, is full of water $(\mu =\frac{4}{3})$. The bottom would be seen at the depth of

What is the resultant figure if the given figure is rotated by an angle of ${270}^{\circ }$ in clockwise direction?

Rahul has set up a new shop where he sells food packaged in iron containers. However, he is receiving a lot of complaints about his food being spoilt. Rahul informed his friend Rohit about this problem. Rohit recommends Rahul to use tin-coated iron containers instead. What could be the reason for this?

What will be the increase in length of a steel rod of length $0.5m$, when its temperature is increased by ${60}^{\circ }C$? The coefficient of linear expansion of steel is $0.000013{}^{\circ }{C}^{-1}$.

The energy consumed when 5 kW power is dissipated for 2 hrs is equal to __ kJ.