Question 2 :
An electric oven of 2 kW power rating is operated in a domestic electric circuit (220V) that has a current rating of 5 A. Will the fuse blow off?

Question 4 :
Which of the following terms does not represent electric power in a circuit?

Question 5 :
Which uses more energy, a 250 W TV set in 1 h or a 1200 W toaster in 10 min?

Question 6 :
A battery of 9 V is connected in series with resistors of 0.2 $\Omega$, 0.3 $\Omega$, 0.4 $\Omega$ , 0.5 $\Omega$ and 12 $\Omega$, respectively. How much current would flow through the 12 $\Omega$ resistor?

Question 8 :
Asolar water heater cannot be used to get hot water on:

Question 9 :
Use Mendeleev's periodic table to predict the formulae for the oxides of the elements 'C'.

Question 10 :
Name two elements that have two electrons in their outermost shells.

Question 12 :
Which of the following is the chemical formula for Bleaching powder.

Question 13 :
When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved, which is utilised in the hydrogenation of oil. Name the gas evolved.

Question 14 :
Carbon, Group (14) element in the Periodic Table, is known to form compounds with many elements. Write an example of a compound formed with oxygen (Group 16 of Periodic Table).

Question 18 :
Complete this law of refraction: Incident ray, refracted ray and normal at the point of incidence lie _____________ .

Question 19 :
A pencil when dipped in water in a glass tumbler appears to be bent at the interface of air and water. Will the pencil appear to be bent to the same extent, if instead of water we use liquids like, kerosene or turpentine?

Question 20 :
A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is pushed into the coil?

Question 21 :
Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong Magnetic Field to your right side. What is the direction of Magnetic Field?

Question 22 :
Among the statements given below select the ones that correctly describe the concept of sustainable development - (i) Planned growth with minimum damage to the environment (ii)Growth irrespective of the extent of damage caused to the environment (iii)Stopping all developmental work to conserve the environment (iv)Growth that is acceptable to all the stakeholders

Question 23 :
The most appropriate definition of a natural resource is that it is a substance/commodity that is -

Question 24 :
What are the materials that remain unchanged over long periods of time?

Question 27 :
Salt A commonly used in bakery products on heating converts into another salt B which is used in the manufacture of glass and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify C.