PHYSICS

SCIENCE : 

SCIENCE ONE MARK QUESTIONS

Fill In The Blanks : 

Fill In The Blanks The relation between time of ascent and time of descent in the case of bodies moving under gravity is ---------- (time of ascent is equal to time of descent) The force between a satellite and the earth, which acts as a centripetal force keeping the satellite in orbit is ------------ (gravitational force)

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The centripetal force required for a car or a bicycle to go round a circular curve depends on ------------ (speed and radius of curvature of the curve) Kepler’s first law of planetary motion is also called----------- (law of orbits) Raindrops assume spherical shape due to ------------- (surface tension)

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Automobiles are now streamlined in shape to ---------- air resistance and improve fuel consumption (reduce) The path of projectile is a ------------- (parabola) ------------- makes use of the centrifugal force for regulating the speed of an engine or machine (Watt governor)

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Forces between molecules of different substances are called --------- forces (adhesive) Surface tension always tends to ------------ the surface of a liquid (contract) The unit of specific heat capacity is ------------ (JKg -1 K-1)

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As compared to boiling evaporation is a --------- (slow and calm process) Latent heat of ice has value --------------- (3.34  105 J/Kg) When a water solidifies to ice ------------ (temperature decreases)

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When a liquid evaporates, its temperature ------- (falls) Evaporation occurs at --------------- (the surface of the liquid) In a rainy day, the relative humidity is ----------- (100 percentage)

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The boiling point of water inside the pressure cooker is ------------- (120 degree Celsius) The volatile liquid used in refrigerator is --------------- (freon) Total amount of heat required to melt the solid -------- (H= mL)

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The specific heat capacity of water is -------------- (4180 JKg-1 K-1) When an impurity is added to ice, the melting point of ice ----------- (is lowered) In the case of wax, the application of pressure ---------- the melting point (lower)

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Among the solids ----------- have high values of coefficient of linear expansion (aluminium) The pressure of steam inside the pressure cooker is about ---------- (atmosphere) The process of changing a solid into gas directly is called ---------- (sublimation)

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A ray of light traveling in air falls obliquely on the surface of a calm pond. It will ------------ (deviate towards the normal) Where should an object be placed so that a real and inverted image of the same size is obtained using a convex lens ? ------------ (at twice the focal length) A ray of light travels from water to air, if the angle of incidence is 40 degree, then the angle of refraction is ------------ (greater than 40 degree)

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The critical angle of diamond is --------------- (24.4 degree) The refractive index of glass depends on -------------- (the size of the glass slab) The colour which deviates the most least during dispersion is --------- (red)

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If an object absorbs all colours it appears ----------- (black) When magenta, yellow and cyan are added, the colour obtained is --------- (white) The SI unit of power of a lens is -------------- (dioptre)

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What are primary colours ? ---------- (red, green and blue) The refractive index of air medium is ------------ (1.0029) The stick within the water appears to be bent due to ---- (refraction)

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The long sightedness defect can be corrected using a suitable ------------ lens (convex) A lens may be regarded as made up of ----------- (large number of tiny prisms) The image formed in a cinema projector is ---------- (erect and real)

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The power of lens can be measured directly using ------ (reciprocal of its focal length) A blue object reflects only ------------ (blue) The optical phenomenon which causes mirage is ------- (illusion)

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In a telescope, the focal length of the objective is ----------- than that of the eye piece (more) Greater the refractive index --------- is the deviation (less) The number of electric lines of force per unit area at right angles to the lines is proportional to ----------- (electric field strength)

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Resistance of a conductor depends on ------------- (material of the conductor only) Heat developed in a conductor is ----------- (directly proportional to the square of current)

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1 HP equals ----------- (746 watts) Electrolytes are usually in the form of ------------ (liquids) The article to be electroplated is placed as ---------- (cathode)

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The primary cell widely used is ---------- (dry cell) The direction of magnetic field due to a current element is given by --------- (Ampere’s swimming rule) Electromagnets are based on the principle of ------- (magnetic effect of current)

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Mechanical energy is converted into electrical energy in a --------- (generator) The deflection produced in a galvanometer is directly proportional to the -------- (current) A moving coil galvanometer can be converted into a voltmeter by connecting a suitable ------------ (high resistance in series)

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The e.m.f induced in a circuit is ---------- (directly proportional to the change in magnetic flux) Fleming’s right hand rule is used to find the direction of ------------ (induced e.m.f) Slip rings are placed in a ------------ (DC generator)

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Electric field is a ------------ quantity and the potential is a ----------- quantity (vector, scalar) If many resistors are connected in parallel, the effective resistance of the combination is ------------ than the ----------- value of the resistance (less, least) The alloy of nickel and chromium is called -------------- (nichrome)

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A galvanometer is converted into an ammeter by connecting a ---------- resistance in ------------ (low, parallel) The direction of the induced current is ----------- to the ---------- producing it (opposite, motion) --------------- transformers are used along with doorbells (step down)

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The input power is -------------- the output power in an ideal transformer (equal) To get a higher value of resistance, ----------- connection is used (series) Split ring commutator is available in ------------- generator (DC)

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Circuit breakers are used for -------------- (industrial and domestic applications) The wave length range of the visible rays in the electromagnetic spectrum is of the order of ------------- (7.8 x 10 –7 m to 3.8 x 10 –7 m) X-rays cannot pass through ----------- (bone)

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When a radioactive nucleus disintegrates by emitting a Beta particle, its atomic number ---------- (increases by one) The radio isotope used in the treatment of cancer is --- (radio cobalt) Which of the following is not electro magnetic in nature ---------- (alpha rays)

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The wave length range of the X-rays in the electromagnetic spectrum is ------- (10–9 to 6  10 –12 m) Human body gives off infra red radiation with a wave length of ------ to ----- (10–3 to 7.8  10 –7 m) The two rays which cannot be deflected by both electric and magnetic fields are -------- and ------- (gamma rays and X-rays)

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Radioactive radiations could be detected and measured by ---------- (Geiger Muller Counter) ------------ is often used to power Heart pacemakers (A nuclear battery)

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