Question 2 :
A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is pushed into the coil?
Question 3 :
State TRUE or FALSE. An electric generator works on the principle of electromagnetic induction.
Question 4 :
A positively charged particle (alpha particle) projected towards West is deflected towards North by a magnetic field. The direction of magnetic field is:
Question 5 :
State TRUE or FALSE. The field at the centre of a long circular coil carrying current will be parallel straight lines.
Question 8 :
Which of the following properties of a proton can change while it moves freely in a magnetic field?
Question 9 :
The strength of magnetic field inside a long current carrying straight solenoid is
Question 11 :
Which of the following methods is suitable for preventing an iron frying pan from rusting?
Question 12 :
Give an example of a metal which is a liquid at room temperature.
Question 13 :
Give an example of a metal which can be easily cut with a knife.
Question 14 :
An aluminium strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change observed is that
Question 15 :
The earthly or undesired materials associated with an ore are called
Question 16 :
Which among the following alloys contain non-metal as one of its constituents?
Question 17 :
Give an example of a metal which is a liquid at room temperature.
Question 18 :
Which one of the following metals is the most reactive and stored in kerosene?
Question 19 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19c7e273b230584979aeb.JPG' />
Samples of four metals A, B, C and D were taken and added to the different solution one by one. The results obtained have been tabulated above. Use the given table to answer the following questions about metals A, B, C and D.
Arrange the metals in decreasing order of reactivity.
Question 20 :
Which of the following methods is suitable for preventing an iron frying pan from rusting?
Question 21 :
Which device is used to change the resistance in the circuit?
Question 22 :
A battery of 9 V is connected in series with resistors of 0.2 ohm, 0.3 ohm, 0.4 ohm, 0.5 ohm and 12 ohm, respectively. How much current would flow through the 12 ohm resistor?
Question 23 :
An electric lamp of 100 Ω, a toaster of resistance 50 Ω, and a water filter of resistance 500 Ω are connected in parallel to a 220 V source. What is the current through the electric iron if it is connected to the same source that and takes as much current as all three appliances?
Question 24 :
An electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and the voltage is 220 V. What is the resistance when heating is at maximum rate?
Question 25 :
State whether the statement is TRUE or FALSE : Parallel arrangement is used in domestic wiring because it provides the same potential difference across each electrical appliance.
Question 26 :
How is voltmeter connected in circuit to measure the potential difference between the two points?
Question 27 :
What is the name of a device that helps to maintain a potential difference across a conductor?
Question 28 :
A copper wire has diameter 0.5 mm and resistivity of $1.6×10^{-8}Ω$m. What will be the length of this wire to make its resistance 10 Ω?
Question 29 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d74273b230584979c08.PNG' />
In the above image, Which material is the best conductor?
Question 30 :
In a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5 ohm resistor, a 8 ohm resistor and a 12 ohm resistor and a plug key, all connected in series and put an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across 12 ohm resistor. What will be the readings in ammeter?
Question 31 :
Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
Question 32 :
Write the balanced chemical equations for the following reactions:
Aluminium + Copper chloride $\rightarrow$ Aluminium chloride + Copper
Question 35 :
What happens when dilute hydrochloric acid is added to iron filings?
Question 36 :
Balance the following chemical equations:
$BaCl_{2} + H_{2}SO_{4} \rightarrow BaSO_{4} + HCl$
Question 37 :
The following reaction is an example of :
$Fe_{2}O_{3} + 2Al \rightarrow Al_{2}O_{3} + 2Fe$
Question 38 :
Oil and fat containing food items are flushed with nitrogen. Why?
Question 39 :
Identify the substances that are reduced in the following reactions.
$CuO(s)+ H_{2}(g) \rightarrow Cu(s)+ H_{2}O(l)$
Question 40 :
Identify the substances that are oxidised in the following reactions.
$4Na(s) + O_{2}(g) \rightarrow 2Na_{2}O(s)$
Question 44 :
Oils containing unsaturated fatty acids should be chosen for cooking. Is it TRUE OR FALSE?
Question 46 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d2c273b230584979bb4.JPG' />
In the given figure, name the compound.
Question 47 :
Alcohol is used as an additive to fuel in some countries. Is it TRUE OR FALSE ?
Question 49 :
Covalent compounds have high melting and boiling points than ionic compounds. Is it TRUE OR FALSE?
Question 52 :
Khadins, Bundhis, Ahars and Kattas are ancient structures that are examples for
Question 54 :
The main cause for abundant coliform bacteria in the river Ganga is -
Question 56 :
The most rapidly dwindling natural resource in the world is -
Question 57 :
It is important to make small check dams across the flooded gullies because they -
(i) hold water for irrigation
(ii) hold water and prevent soil erosion
(iii) recharge ground water
(iv) hold water permanently
Question 58 :
From the given options, pick the item that is not a natural resource
Question 61 :
What were the criteria used by Mendeleev in creating his periodic table?
Question 62 :
Use Mendeleev's periodic table to predict the formulae for the oxides of the elements 'C'.
Question 63 :
What were the criteria used by Mendeleev in creating his periodic table?
Question 64 :
Name two elements that have two electrons in their outermost shells.
Question 65 :
Use Mendeleev's periodic table to predict the formulae for the oxides of the elements 'C'.
Question 66 :
Name two elements that have two electrons in their outermost shells.
Question 67 :
Use Mendeleev's periodic table to predict the formulae for the oxides of the elements 'Si'.
Question 68 :
Use Mendeleev's periodic table to predict the formulae for the oxides of the elements 'Al'.
Question 70 :
Use Mendeleev's periodic table to predict the formulae for the oxides of the elements 'C'.
Question 71 :
Suggest one word for the statement/ definition: Organisms which depend on the producers either directly or
indirectly for food
Question 73 :
State TRUE or FALSE: The use of chemicals like CFCs has endangered the ozone layer.
Question 74 :
The increase in the concentration of harmful chemical substances in the body of living organisms at each trophic level of a food chain is called
Question 75 :
State True or False: Producers prepare their own food from inorganic compounds
Question 76 :
Give a way in which biodegradable substances would affect the environment.
Question 78 :
In which year UNEP succeeded in forging an agreement to freeze the CFC production at 1986 levels?
Question 79 :
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
Question 81 :
______ of organisms fill well-defined places, or niches, in the ecosystem, using their ability to reproduce.
Question 82 :
Reproduction at its most basic level will involve making copies of the blueprints of body design. Is it TRUE or FALSE?
Question 83 :
The thread-like structures that are developed on the bread above the hyphae of the bread mould (Rhizopus) , are reproductive?
Question 84 :
Pollen grains are yellow in colour in hibiscus flower.Is it TRUE or FALSE?
Question 87 :
________ is present in the centre of a flower and is the female reproductive part.
Question 88 :
Roots, stems and leaves of some plants develop into new plants through :-
Question 90 :
The division of organism or a cell into two or more parts and the regeneration of each part into a new organism or a new cell is called?
