10TH CLASS Science Part 1

10th Class Science Part 1

The weight of an object of mass 15 kg at the center of the earth is
147 kg
150 N
147 N
0
Centripetal force has the same direction as the ………
Centripetal velocity
Angular speed
Centripetal acceleration
Angular accleration
The three laws describing planetary motion have been given by …
Kepler
Galileo
Newton
Einstein
The orbit of a planet revolving around a star is …
2 points
Towards the focal point
Elliptical
Circular
Linear
The line joining the planet and the sun sweeps equal ….. in equal interval of time.
2 points
Time
Distance
Volume
Area
The square of a planet`s period of revolution around the sun is directly proportional to the …… of the mean distance of a planet from the sun.
Cube
Square Root
Square
Cube Root
The …. force is much weaker than other forces in nature.
2 points
Inter-molecular
Nuclear
Gravitational
Electromagnetic
….. is necessary to change the speed as well as the direction of motion of an object.
2 points
Momentum
Force
Inertia
Motion
Newton invented a new branch of mathematics called ….
Calculus
Geometry
Trignometry
Statistics
The first scientist to construct a reflacting telescope was ….
2 points
Galileo
Kepler
Copernicus
Newton
Which of the following statement is not a correct statement about the trends when going from left to right across the periods of the periodic table.
The oxides become more acidic.
The number of valence electrons increases.
The elements become less metallic in nature.
The atoms lose their electrons more easily.
The modern periodic table was prepared by……
2 points
Dobereiner
Newlands
Bohr
Mendeleev
An element x form an oxide and oxide x203. In which group of mendeleev’s periodic table is this element placed ?
2 points
Group 4
Group 5
Group 2
Group 3
The atomic numbers of four elements P,Q,R & S are 6,8,14 &16 respectively. Out of these element known as metalloid is:
2 points
P
Q
R
S
The three imaginary elements X,Y & Z represent a dobereiner’s triad. If the mass of elements X is 14 & that of element Y is 46, then the atomic mass of element Z will be :
28
60
78
72
In Mendeleev’s Periodic table,gaps were left for the elements to be discovered later on.an elements which found a Vacant place in the Periodic table later on is:
2 points
Ge
Be
Si
Se
Three elements having chemical symbol of Si, B, and Ge are:
*
2 points
All metals
All non metals
All metalloids
Si is metalloid ,B is metal & Ge is non metal
Which of the following is not a representative element?
*
2 points
Fe
K
Ba
N
The scientist who made maximum contribution towards periodic table was:
*
2 points
Rutherford
Dalton
Mendeleev
Chadwick
Give the two members of a dobereiner triad are phosphorus and antimony , the third member of this triad is —
*
2 points
Iodine
Arsenic
Calcium
Sulphur
Reaction of magnesium’ with air is

* 2 points

Exothermic reaction Endothermic reaction Reversible reaction. Substitution reaction What chemicals are used in fireworks? * 2 points copper chloride Calcium chloride Barium chloride all of above Galvanometer is sensitive device which works on the same principle as that of —— * 2 points Electric generator Electric iron Electric heater Electric motor The intensity of magnetic field within the solenoid is * 2 points Uniform Non uniform Uniform and non uniform None of these Direction of force exerted on the current carrying conductor can be determined by ——- * 2 points Fleming’s Left-Hand Rule Thumb rule Fleming’s right hand rule Electromagnetic induction In electrical motor ——— energy get converted into ——– energy. * 2 points Potential, Electrical Electrical ,Thermal Mechanical , Electrical Electrical Mechanical In 1 second alternating current changes its direction by ——— times. * 2 points 50 1 100 2 Electric bulb works on the principle of ——– * 2 points Electromagnetic induction Magnetic effect of electric current Fleming right hand rule Heating effect of electric current Electric generator works on the principle of —– * 2 points Fleming’s left hand rule Ohm’s law Electromagnetic induction Newton’s second law Intensity of magnetic field at any point produced by current flowing through a wire is dependent on — * 2 points Atmosphere Current Resistivity Resistance A cell is connected to a 4 oham resistance because of which heat of 25 J is produced per second due to current flowing through it. Then the potential difference applied across the resistance will be —- * 2 points 5 volt 10 volt 15 volt 20 volt Miniature circuit breakers are used in a circuit — * 2 points Control over resistivity Control over current Control over cost Control word resistance Colour of magnesium oxide is _
*
2 points
white
Blue
Grey
Pink
It magnesium is gently heated, it forms _ 2 points

magnésium nitrate

magnesium sulfide

magnesium carbonate

magnesium oxide

When carbon dioxide is passed through time water * 2 points

Calcium hydroxide is formed white precipitate of cao is formed lime water turns milky colour of lime water disappears.

When crystals of lead nitrate are heated strongly in a dry test tube * 2 points

Crystals immediately malt A brown residue is left.

White fumes appear in the tube.

Yellow residue is left.

Colour of solid magnesium is_
2 points
Dark grey
Silver grey
Black
Whitish silver
In writing chemical reactions, inclusion of state symbols shall be done while
2 points
Correct chemical formula of reactants and products are written.
The equation is being balanced to fulfill the law of conservation of mass.
The equation has been balanced.
The chemical formulae of products and reactants have been change to bring about quick balancing.
Consider reaction :. Na (s) + O2(g) —— Na2O(s). Moles of sodium needed to balance equation would be.
*
2 points
1
2
3
4
S (s) + O2 (g) —- So2. State of So 2 in this reaction is —
*
2 points
Liquid
Solid
Gaseous
All these
The constant temperature at which the ice convert into water is called the the ———— of ice.
*
2 points
Latent heat of vaporization
Boiling point
latent heat of fusion
Melting point
The latent heat of vaporization of water is —-
*
2 points
54 cal/g
500 cal/g
80 cal/g
540 cal/g
The latent heat of fusion of ice is—-
*
2 points
540 cal/g
80 cal/g
800 cal/g
4 cal/g
The mass of vapour present in a unit volume of air is called ——
*
2 points
Relative humidity
Humidity
Absolute humidity
None of these
At 4° C , the volume of water is—-
*
2 points
Minimum
Maximum
None of these
Equal to density
Which of the following substance contracts on heating ?
*
2 points
Lake warm water
Ice
Iron
Mercury
The vapour content in the year is measured by —–
*
2 points
Relative humidity
Dew point
Absolute humidity
None of these
Humid and dry nature of air depends on the the—-
*
2 points
Amount of vapour in the air
Amount of vapour to make the air saturated
Temperature of the air
Volume of the air
Vapours in air condenses to form —-
*
2 points
fog
Snowfall
rainfall
Snowfall and rainfall
When the temperature of water decreases below 4 ° C its volume……
2 points
Decreases
Increases
Remains same
None of these
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