Practice Test

Q1) The period of vibration of a simple pendulum is : Show Answer

Q2) A simple pendulum has some time period T. What will be the percentage change in its time period if its amplitude is decreased by 5% : Show Answer

Q3) The period time of a simple pendulum of length 1 m and amplitude 2 cm is 5 sec. If the amplitude is mad 4 cm, its periodic time in sec will be : Show Answer

Q4) For a simple pendulum the graph between L and T will be a : Show Answer

Q5) The period of a simple pendulum is doubled when : Show Answer

Q6) The period of oscillation of a simple pendulum of constant length at a place inside a mine is : Show Answer

Q7) A second's pendulum is mounted in a rocket. Its period of oscillation will decrease when the rocket is : Show Answer

Q8) A second's pendulum is working in a lift. If the lift begins to fall freely towards the earth, what will be the time period of the pendulum in this case ? Show Answer

Q9) If the length of a second's pendulum is increased by 2%, how many seconds will it lose per day ? Show Answer

Q10) If a pendulum clock is shifted from Lucknow to Nainital it will : Show Answer

Q11) The time period of a simple pendulum in a freely falling lift is : Show Answer

Q12) When a simple pendulum is executing SHM, about its mid position : Show Answer

Q13) For an oscillating simple pendulum, the time period is Show Answer

Q14) A hollow sphere is filled with mercury through a small hole at the bottom in it. It is suspended by a long thread and as the mercury slowly flows out of the hole at the bottom, the length of pendulum Show Answer

Q15) A lever helps you to do work because it : Show Answer

Q16) A balloon rises in air because : Show Answer

Q17) Which of the following is valid even in perfect vacuum ? Show Answer

Q18) A pair of forceps is a lever of Show Answer

Q19) A uniform see-saw, 4 m long is supported at its centre. A girl weighing 30 kgf sits at a distance of 1 m from the centre of the see-saw. Find out where should a boy of weight 10 kgf must sit on the other side of the see-saw so as to balance the weight of the girl. Show Answer

Q20) Liquid contained in Mariner's compass Show Answer

Q21) Compass is used by navigators Show Answer

Q22) The longest periscope in the world is Show Answer

Q23) Periscope are used Show Answer

Q24) A periscope corresponds the phenomenon of Show Answer

Q25) A telescope as compared to a microscope has : Show Answer

Q26) A microscope has an objective of 5 mm focal length and eyepiece of 30 mm focal length and the distance between them is 150 mm. The magnification is : Show Answer

Q27) In a simple microscope, if the final image is located at infinity then its magnifying power is : Show Answer

Q28) The focal length of the objectives of a microscope is : Show Answer

Q29) In a simple two lens refracting microscope, the intermediate image, in normal use is : Show Answer

Q30) When length of a microscope tube increase, its magnifying power : Show Answer

Q31) In a reflecting astronomical telescope, if the objective ( a spherical mirror) is replaced by a parabolic mirror of the same focal length and aperture, then : Show Answer

Q32) In which of the following the length of the tube is equal to the sum of the focal lengths of the field and eye lenses ? Show Answer

Q33) The objective of a small telescope has focal length 120 cm and diameter 5 cm. The focal length of the eyepiece is 2 cm. The magnifying power of the telescope for distant object is : Show Answer

Q34) Balloons used for commercial purposes can rise as high as Show Answer

Q35) Superpressure balloons carry Show Answer

Q36) gas balloons mainly consist of Show Answer

Q37) A pressure cooker Show Answer

Q38) Gramophone was invented by Show Answer

Q39) The function of the weight valve in a pressure cooker is : Show Answer

Q40) Choose the correct statement : Show Answer

Q41) Choose the incorrect statement : Show Answer

Q42) Mouthpiece of telephone converts Show Answer

Q43) Basically, a communication system is a : Show Answer

Q44) One telegraph circuit : Show Answer

Q45) Siphon is used to : Show Answer

Q46) Thermos-flask with circular cross-sections are better because they avoid less loss or gain of heat by : Show Answer

Q47) In a water pump water can be raised up to a maximum height of : Show Answer

Q48) The outer casing of an electric iron is generally connected to earth in order to Show Answer

Q49) A three pin plug is connected to the lead for a 1 kW electric iron to be used on a 250 V supply. Which of the following statements is not correct ? Show Answer

Q50) The filament of an electric bulb is generally made from Show Answer

Q51) A fuse is a short piece of wire made up of tin-lead alloy having Show Answer

Q52) Pumps used for viscous liquids is termed as Show Answer

Q53) The pump used to move the coolants in Nuclear reactors are Show Answer

Q54) Electromagnets are used in Show Answer

Q55) A standard keypad of a telephone consists of Show Answer

Q56) The transmitter of the telephone is also named as Show Answer

Q57) Pressure difference between points B and C is Show Answer

Q58) Speed of the liquid as it flows out of the lower end of the tube is Show Answer

Q59) Telegraph's are mostly used in Show Answer

Q60) The device which can send electrical impulses directly over telegraph lines to similar printers at the receiving end is called Show Answer

Q61) The latest replacement of telegraph is Show Answer

Q62) Bicycle pump has Show Answer

Q63) Lift pumps are used to Show Answer

Q64) The first long distance fibre cable for telephony was completed in Show Answer

Q65) Thermos flask was invented by Show Answer

Q66) Thermos flask works on the principle of Show Answer

Q67) Thermos flask is also termed as Show Answer

Q68) In a pressure cooker, cooking is fast because Show Answer

Q69) The filament of an electric bulb is generally made from Show Answer

Q70) A fuse is a short piece of wire made up of tin-lead alloy having Show Answer

Q71) A hollow sphere is filled with mercury through a small hole at the bottom in it. It is suspended by a long thread and as the length of pendulum Show Answer

Q72) Aneroid barometer is so called, because Show Answer

Q73) Which of the following is valid even in perfect vacuum ? Show Answer

Q74) A pair of forceps is a lever of Show Answer

Q75) Gramophone was invented by Show Answer

Q76) A periscope corresponds the phenomenon of Show Answer

Q77) A telescope as compared to a microscope has Show Answer

Q78) When a simple pendulum is executing SHM, about its mid position Show Answer

Q79) For an oscillating simple pendulum, the time period is Show Answer

Q80) In a Fortin's barometer Show Answer

Q81) A sudden decrease in the barometer shows Show Answer

Q82) A level helps you to do work because it Show Answer

Q83) Which one of the following is produced by rain water action ? Show Answer

Q84) Which one of the following is not a source of renewable energy ? Show Answer

Q85) In a pressure cooker is faster because the increase in vapour pressure Show Answer

Q86) Microwave oven consumes less power due to Show Answer

Q87) What is the telescope designed to search for earth-size planets in the near by region of our galaxy, termed as ? Show Answer

Q88) Consider the following statements about a microscope and a telescope.
1. Both the eyepiece and the objective of a microscope are convex lenses.
2. The focal length of the objective of a telescope is larger than the focal length of its eyepiece.
3. The magnification of a telescope increases with the increase in focal length of its objective.
4. The magnification of a microscope increases with the increase in focal length of its objective.
Which of the statement(s) given above are correct?
Show Answer

Q89) Which one of the following statements is not correct?
Show Answer

Q90) Radioactivity is measured by
Show Answer

Q91) A deep sea diver may hurt his car drum during diving because of
Show Answer

Q92) In optical instruments, the lenses are used to form image by the phenomenon of Show Answer