Practice Test

Q1) What is the SI unit of energy? Show Answer

Q2) How many calories are there in one kilo-calorie? Show Answer

Q3) What is absolute zero on Celcius scale? Show Answer

Q4) What is the freezing point of water on Fahrenheit scale? Show Answer

Q5) Which of the following statements are true regarding heat ? Heat is a form of energy.
Heat can be reflected by a mirror.
Heat is an electromagnetic radiation.
Heat cannot pass through vacuum.
Select the correct answer from the codes given below Show Answer

Q6) Thermodynamics mostly deals with Show Answer

Q7) Which of the following is the smallest temperature? Show Answer

Q8) The principle of working of periscope is based on Show Answer

Q9) In which of the following experiments, the quantum nature of light has to be used ,to explain the observations? Show Answer

Q10) A slerioscopic camera produces an image , which is Show Answer

Q11) Who first introduced a simple pendulum? Show Answer

Q12) What is the time period of a pendulum of length 9.8 m? Show Answer

Q13) Which of the following is a derived unit? Show Answer

Q14) A scooter driver over an oily road generally slips because on the oily road Show Answer

Q15) The mode of propagation of heat from the Sum to the Earth is Show Answer

Q16) Air is blown over a hot body to cool it,This would increases the rate of heat loss by Show Answer

Q17) By which of the following mechanism would heat be lost from a hot object standing on a metal table on the surface of moon? Show Answer

Q18) A person standing before a furnace receives most of the heat by
Show Answer

Q19) An air bubble inside water behaves as a
Show Answer

Q20) If half of the body of a lens is covered with black-paper the image produced by the lens will Show Answer

Q21) Which one of the following optical instruments produce a virtual image?
Show Answer

Q22) A man cannot see an object distinctly at a distance less than 1m. He is suffering from Show Answer

Q23) The image of an object formed by a device is always virtual and small. the Device in question is a Show Answer

Q24) A person standing in front of a mirror finds his image thinner but with normal height. The mirror in question is
Show Answer

Q25) Focal length of the eye-lens which enables us to see the object at varying distances, is controlled and changed by
Show Answer

Q26) Panchromatic photographic film is sensitive to
Show Answer

Q27) Which law of motion is called 'law of inertia'? Show Answer

Q28) A rocket or a jet engine works on the principle of
Show Answer

Q29) Newton's second law of motion gives the measure of
Show Answer

Q30) What is the SI unit of power? Show Answer

Q31) Joule is the unit of Show Answer

Q32) A body at rest can have Show Answer

Q33) Potential energy of your body is minimum when Show Answer

Q34) What is the CGS unit of heat?
Show Answer

Q35) What is the CGs unit of latent heat? Show Answer

Q36) At what temperature do the Fahrenheit and Celcius thermometers give the same reading?
Show Answer

Q37) What is the SI unit of force? Show Answer

Q38) Which of the following is a scalar quantity?
Show Answer

Q39) Thermometer is a device to measurer Show Answer

Q40) Temperature of a body is due to the
Show Answer

Q41) The state of thermal equilibrium between two bodies is characterised by the property?
Show Answer

Q42) Heat flows from one body to another because of their difference in Show Answer

Q43) Water is used in hot water bottles because Show Answer

Q44) A man pushes a wall but fails to displace it He does
Show Answer

Q45) Which one of the following phenomena occurs at absolute zero temperature ? Show Answer

Q46) Two force 25 N and 16 N act on a body of mass 1.0 kg. The minimum acceleration will be Show Answer

Q47) Whenever a horse pulls a cart, the force helpful in the movement of the horse is the force exerted by Show Answer

Q48) An artificial satellite is revolving around earth. The physical quantity which is conserved is Show Answer

Q49) What is the SI unit of charge ? Show Answer

Q50) The relation between kinetic energy K and liner momentum p of a particle is represented by Show Answer

Q51) Two particles of masses 4 kg and 9 kg posses kinetic energies in the ratio 9/4. The ratio of their liner moments will be Show Answer

Q52) Newton or kilogram is unit of Show Answer

Q53) What is measured by the Altimeter? Show Answer

Q54) Electrical power is measured by the Show Answer

Q55) A decibel is Show Answer

Q56) A bullet of mass m is fired with velocity v' in a large bulk of mass M. The final velocity v' will be Show Answer

Q57) A force of 100 N acts a huge mass of 100 kg for 0.1 second. Change in momentum will be Show Answer

Q58) Two bodies A and B having masses in the ratio 3 : 1, possesses the same kinetic energy. The ratio of their linear momentum is Show Answer

Q59) The linear momentum of a particle of mass 1 kg and kinetic energy 2 J is equal to Show Answer

Q60) The kinetic energy of body increases by 300% due to change in its velocity. The momentum,increases by Show Answer

Q61) The momentum of a body increases by 50% due to change in its velocity. The kinetic energy of the body increases by Show Answer

Q62) A rifle shoots a bullet of 60 g with a velocity of 50 m/s. The velocity of recoil of rifle 2m/s. The mass of rifle is Show Answer

Q63) One gram of matter is completely converted into energy, Energy released is Show Answer

Q64) The SI unit of calorific value is Show Answer

Q65) Two particles of equal masses have ratio of their linear momenta as 2 : 3. The ratio of kinetic energies will be Show Answer

Q66) If the frequency of vibrations of body is decreased and its amplitude is increased, then Show Answer

Q67) In which of the following cases of motion,are the distance moved and the magnitude of displacement-equal? Show Answer

Q68) An air bubble inside water behave like a Show Answer

Q69) If the pressure over a liquid increases, its boiling point Show Answer

Q70) A feather weighing 5g and a nail weighing 10g have the same kinetic energy. Which of the following statement is true about the momentum of the two bodies? Show Answer

Q71) Light year is the unit..... Show Answer

Q72) A 200W bulb and 100W bulb, both meant for operation at 220V are connected in serial to 220V Supply. The power consumed by them will be? Show Answer

Q73) What is the unit of Angular momentum? Show Answer

Q74) Geothermal energy is an alternative source of energy. For this energy, the most feasible regions are those that Show Answer

Q75) An object of mass 5 kg is sliding on a smooth frictionless horizontal surface with a constant velocity of 10 m/s. The force required to keep the object moving with the same velocity is Show Answer

Q76) You are provided with a concave mirror,a concave lens,a convex mirror and a convex lens. To obtain an enlarged image of an object you can use either. Show Answer

Q77) Before playing a sitar, a sitarist always adjusts the tension of the string of the sitar and tries to plunk it suitably. By doing so the sitarist adjusts the Show Answer

Q78) If you are asked to project the image of a well- lit painting on the wall, which one of the following optical devices would you select for this purpose? Show Answer

Q79) While teaching the correct method of reading a clinical thermometer to class VIII students, Neha mentions the following necessary precautions to be taken.
Which one of the following precautions has been mentioned wrongly by the teacher? Show Answer

Q80) An object is vibrating at 5000 Hz, the time period of the sound produced is Show Answer

Q81) A bus covers the first 10 km of its journey at an average speed of 40 km/h and the remaining 45 km at an average speed of 60 km/h. The average speed of the bus for its total journey is Show Answer

Q82) Impression of an image persists on the retina of human eye for about Show Answer

Q83) The ultrasound equipments used for investigating medical problem work at frequency Show Answer

Q84) A solid rectangular block of iron is kept over the top of a table with its different faces touching the table. In different cases, the solid block exerts. Show Answer

Q85) The odometer reading of a moving car at 8:00 am is 36540 km and at 10:00 am 36666 km. If the car is moving on a zigzag path with variable speeds, its average speed (in m/s) is Show Answer

Q86) The normal temperature of human body on the celsius scale and fahrenheit scales is respectively Show Answer

Q87) Select the one which is different from the others in the manner it is applied Show Answer

Q88) While teaching the topic on 'Motion and Time' to Class VII students, Savita gave examples of different kinds of motion to the students. Which one of the following examples was quoted by by her incorrectly? Show Answer

Q89) An object of mass 6 kg is sliding on a frictionless horizontal surface with a uniform speed of 3 m/s. The force required to keep the object moving at the same speed along the same straight line is Show Answer