AP SSC 10th class General Science Model paper 2015-16 English Medium Set 1
Section-I
Group – A
1.How do you get a virtual image using a concave mirror ?
2.convex lens is made up of three different materials as shown in the figure. How many images does it form ?
3.A wire of length 1 m and radius 0.1 mm has a resistance of 100 £2. Find the resistivity of the material.
4.Which experiments do you suggest to understand Faraday’s law ? What suggestions do you give to get good results for the experiment ?
Group – B
5.Why do you apply paint on iron articles ?
6.Dry hydrogen chloride gas does not turn blue litmus to red whereas hydrochloric acid does. Why ?
7.Name two elements that have chemical properties similar to magnesium. Justify your answer.
8.Explain in brief, an experiment to prove that the presence of air and water are essential for corrosion.
Section – II
9.What happens to the water when wet clothes dry ?
10.Take a bright metal ball and make it black with soot on a candle flame. Immerse it in the water. Mention one observation.
11.Which lens do you use to correct the eye defect, Myopia ?
12.Why does tooth decay start when the pH of mouth is lower than 5.5 ?
13.Which rule is violated in the electronic configuration ls°2s2 2p4 ?
14.Define Moseley’s Periodic Law.
Section-III
Group – A
15.Explain the procedure of finding specific heat of a solid experimentally.
16.What is the angle of deviation produced by a glass slab ? Explain with ray diagram.
17.Explain an experiment to produce a rainbow in the classroom.
18.How can you verify that a current carrying wire produces a magnetic field with the help of an experiment ?
Group – B
19.What is the difference between displacement and double displacement reactions ? Explain with an example.
20.Explain the significance of three quantum numbers in predicting the position of an electron in an orbit.
21.Define hybridization. Explain the formation of BeCl2
22.What is thermite process ? Mention its applications in daily life.
Section-IV
23.Draw the circuit diagram of a circuit in which two resistors, A and B are connected in series with a battery and a voltmeter is connected to measure the potential difference across the resistor A.
24.Draw the neat diagram of a reverberatory furnace and label it.
Answers
Section -I
Group-A
1.How do you get a virtual image using a concave mirror ?
Ans.If we place an object between the pole and focus of the concave mirror then we will get a virtual image.
2.A convex lens is made up of three different materials as shown in the figure. How many images does it form ?
Ans.1) The lens has been made up of three different materials.
2)Hence three images are formed.
3.A wire of length 1 m and radius 0.1 mm has a resistance of 100 Q. Find the resistivity of the material.
Ans.
4.Which experiments do you suggest to understand Faraday’s law ? What suggestions do you give to get good results for the experiment ?
Ans.1) Bring the North pole, South pole of a bar magnet near a circular coil whose end terminals are connected to a galvanometer. By observing the deflection in the galvanometer we observe that electricity* is formed in the coil by the relative movement of coil and magnet.
2)Whenever there is a continuous change of magnetic flux linked with a closed coil, a current is generated in the coil. This is one form of Faradays law.
Precautions:
1.of turns of the coil and area of the coil should be more.
2.The speed of the bar magnet towards and away from the coil should be increased, so that galvanometer readings can be noted clearly.
Group-B
5.Why do you apply paint on iron articles ?
Ans.1) Ferrous reacts with oxygen in the air and form iron oxide. This reaction is called corrosion.
2)In order to protect iron articles from rusting.
6.Dry hydrogen chloride gas does not turn blue litmus to red whereas hydrochloric acid does. Why ?
Ans.1) Dry hydrogen chloride gas is not an acid. Hence it can’t turn blue litmus into red.
2)Hydrochloric acid is an aqueous solution. Hence it can turn blue litmus to red.
7.Name two elements that have chemical properties similar to magnesium. Justify your answer.
Ans.1.Two elements that have chemical properties similar to magnesium are beryllium and calcium.
2.The reason is they belong to the same group IIA.
8.Explain in brief, an experiment to prove that the presence of air and water are essential for corrosion.
Ans.1.Take 3 test tubes and place clean iron nails in each of them, pour water in first test tube to its half.
2.Pour boiled distilled water immersing the nails completly and pour 1 ml of oil on it. put anhydrous calcium chloride in the 3rd test tube.
3.Leave the test tubes for a few days and then observe.
4.Now we observe that nails in the first test tube rust but those in second and third do not rust. This because the nails in first test tube are exposed to water and air.
Section-II
9.What happens to the water when wet clothes dry ?
Ans.Water evaporates and mixes with air in the surroundings.
10.Take a bright metal ball and make it black with soot on a candle flame. Immerse it in the water. Mention one observation.
Ans.1) The ball shines 2) The ball appears to raise up in water.
11.Which lens do you use to correct the eye defect, Myopia ?
Ans.Bi-concave lens.
12.Why does tooth decay start when the pH of mouth is lower than 5.5 ?
Ans.If the pH value of water is less than 5.5 the acidic nature increases and corrodes the tooth enamel causing tooth decay.
13.Which rule is violated in the electronic configuration ls°2s22p4 ?
Ans.Aufbau rule.
14.Define Moseley’s Periodic Law.
Ans.Moseley rule : The physical and chemical properties of the elements are the periodic functions of their Atomic numbers.
Section-III
Group-A
15.Explain the procedure of finding specific heat of a solid experimentally.
Ans.Aim : To find the specific heat of a given solid.
Material required : Calorimeter, thermometer, stirrer, water, steam heater, wodden box and lead shots.
Procedure:
1.Let the mass of the calorimeter along with stirrer is ‘nij’ gm.
2.One third of the volume of the calorimeter is filled with water and its mass is “m2” gm.
3.The temperature of the calorimeter is noted (T1°C).
4.The heated lead pieces (m3 gm. and T2°C) are quickly transfered into calorimeter, with minimum loss of heat.
5.Contents in the calorimeter are stirred and then resultant temperature (T3°C) is noted.
6.Let the specific heats of the calorimeter, led shots and water are Sc, Sl and Sw respectively.
7.By using the formula we calculate the specific heat of the given solid
16.What is the angle of deviation produced by a glass slab ?Explain with ray diagram
Ans.1) Angle of deviation is the angle between incident ray and emergent ray.
2) The angle of deviation produced by a glass slab is ‘O’ (zero) because the incident ray and emergent ray are parallel to each other as shown in the figure.
17.Explain an experiment to produce a rainbow in the classroom
Ans.To produce a Rainbow in the Classroom :
1.Take a metal tray and fill it with water.
2.Place a mirror in water such that it makes an angle to the water surface.
3.Now focus white light on the mirror through the water.
4.Keep a white card board sheet above the water surface.
5.Now we can observe the white light disperses and form Rainbow.
18.How can you verify that a current carrying wire produces a magnetic field with the help of an experiment ?
Ans.1.Take a thermocole sheet and fix two thin wooden sticks of height 1cm. Which have small slit at the top of their ends.
2.Arrange a copper wire ‘24 gauge’ so that it passes through these slits and make a circuit.
3.This circuit consists of a battery, key, copper wire in series.
4.Keep a magnetic compass below the wire as shown in the figure
Procedure:
1.Bring a barmagnet close to the compass. The needle in the compass gets deflected due to the magnetic field of the bar magnet.
2.Remove the magnet, take it away from the circuit. You will not observe any deflection in the needle.
3.Now switch on the circuit and will observe deflection in the needle of the compass.
4.Now we come to know that this is due to the magnetic field produced by the current carrying wire.
Group-B
19.What is the difference between displacement and double displacement reactions ? Explain with an example.
Ans.
20.Explain the significance of three quantum numbers in predicting the position of an electron in an orbit
Ans.1)Pridicting the position of electron in an orbit is described by a set of three quantum numbers.
(i)Principal Quantum number (n)
(ii)Angular momentum quantum number (l)
(iii)Magnetic quantum number (m)
2)Principal quantum number (n) tells about the size and energy of the main shell.
3)The Angular momentum quantum number (l) defines the shape of the orbital occupied by the electron.
4)The Magnetic quantum number describes the orientation of the orbitals.
21.Define hybridization. Explain the formation of BeCl2
Ans.Hybridisation : It is a phenomenon of inter mixing of atomic orbitals of almost equal energy which are present in the outer shells of the atom and their re-shuffling or redistribution into the same number of orbitals but with equal properties like energy and shape.
Formation of BeCQ:
(a)Be atom in its excited state allows its 2s orbital and 2px orbital which contain unpaired electrons to intermix and redistribute to two identical orbitals.
(b)As per Hund’s rule each orbital gets one electron.
(c)The new orbitals based on the types of orbitals that have undergone hybridisation are called sp orbitals.
(d)The two sp orbitals of Be get separated by 180°.
(e)Now each chlorine atom comes with its 3pz1 orbital and overlaps it the sp orbitals of Be forming two identical Be- Cl bonds (sigma sp-p bonds).ClBeC = 180°.
22.What is thermite process ? Mention its applications in daily life.
Ans.1) Thermite process involves the reaction of metal oxides with Aluminium.
2)When highly reactive metals such as sodium, calcium, aluminium, etc., are used as reducing agents, they displace metals of lower reactivity from the compound.
3)These displacement reactions are highly exothermic. The amount of heat evolved is so large that metals produced are in molten state.
Applications of thermite process :
1) The reaction of Iron oxide (Fe2O3) with aluminium is used to join railings of railway tracks or cracked machine parts.
2) Joining of cracked metal utensils in the house.
Section-IV
23.Draw the circuit diagram of a circuit in which two resistors, A and B are connected in series with a battery and a voltmeter is connected to measure the potential difference across the resistor A
Ans.
24.Draw the neat diagram of a reverberatory furnace and label it
Ans.
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