List of practice Questions

Formation of interstitial compound makes the transition metal

Three blocks of masses $2\, kg , 3 \,kg$ and $5 \,kg$ are connected to each other with light string and are then placed on a frictionless surface as shown in the figure. The system is pulled by a force $F=10 \,N$, then tension $T_{1}=$

Abdul, while driving to school, computes the average speed for his trip to be $20$ $km\, h^{–1}$. On his return trip along the same route, there is less traffic and the average speed is $30$ $km \,h^{–1}$. What is the average speed for Abdul’s trip?

One mole of hydrogen at 100$^\circ$C is mixed with one mole of oxygen at 10$^\circ$C. What will be the temperature of the mixture ? Mass of one mole of hydrogen = 2 g and that of one mole of oxygen is 32 g

What difference does the author note between the flute seller and the other hawkers?

Explain briefly how +2 state becomes more and more stable in the first half of the first row transition elements with increasing atomic number?

The value of $\:sin^{-1}\left(cos\left(\frac{33\pi }{5}\right)\right)$

Explain why is ortho nitrophenol more acidic than ortho methoxyphenol.

Why does Valli refuse to look out of the window on her way back?

A milk tank is in the form of cylinder whose radius is 1.5 m and length is 7 m. Find the quantity of milk in litres that can be stored in the tank.

Discuss the nature of bonding in metal carbonyls

1. A communal war broke out when the princess was abducted by the neighboring prince.
2. The cockpit broke off from the plane during the plane crash.
3. The car broke down on the way and we were left stranded in the jungle.
4. The dacoit broke away from the police as they took him to court.
5. The brothers broke up after the death of their father.
6. The thief broke into our house when we were away

Column A	Column B
(i) break out	(a) to come apart due to the force
(ii) break off	(b) end a relationship
(iii) break down	(c) break and enter illegally; unlawful trespassing
(iv) break away (from)	(d) of start suddenly, (usually a fight, someone) a war or a disease)
(v) break up	(e) to escape from someone’s grip
(vi) break into	(f) stop working

In Rutherford scattering experiment, the correct angle of scattering of alpha particles for impact parameter equal to zero is

The dispersive powers of the materials of convex lens and concave lens and concave lens placed in contact are in the ratio 1 : 2. For the achromatic combination, we take convex lens of focal length 100 cm. What should be the focal length of concave lens ?

The area of a trapezium is 34 cm2 and the length of one of the parallel sides is 10 cm and its height is 4 cm. Find the length of the other parallel side.

What are the different types of RNA found in the cell ?

The outer electronic structure of $3s^23p^5$ is possessed by

A steel wire has a length of 12.0 m and a mass of 2.10 kg. What should be the tension in the wire so that speed of a transverse wave on the wire equals the speed of sound in dry air at 20 °C = 343 m s^–1 .

A small bulb is placed at the bottom of a tank containing water to a depth of 80cm. What is the area of the surface of water through which light from the bulb can emerge? The refractive index of water is 1.33. (Consider the bulb to be a point source.)

The sum of protons,electrons and neutrons in the heaviest isotope of hydrogen is

Twenty-seven solid iron spheres, each of radius r and surface area S are melted to form a sphere with surface area S'. Find the
(i) radius r' of the new sphere,
(ii) ratio of S and S'

Find out from internet what is golden rice.

Three immiscible liquids of densities $d_1 > d_2 > d_3$ and refractive indices $\mu_1 > \mu_2 > \mu_3$ are put in a beaker. The height of each liquid column is $h/3$. A dot is made at the bottom of the beaker. For near normal vision, find the apparent depth of the dot.

Discuss in small groups taking off from points in the text.
1. Film-production today has come a long way from the early days of the Gemini Studios.
2. Poetry and films.
3. Humour and criticism

What are interstitial compounds? Why are such compounds well known for transition metals?