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Physics Test 19
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Physics Test 19

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  • Question 1/29
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    Directions For Questions

    The velocity of sound in air decreases as the humidity increases

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    Which one of the following statements is NOT correct ?
    Solutions
    The velocity of sound in air decreases as the humidity increases
  • Question 2/29
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    The body has a radial acceleration w^2 r directed towards the centre of the path

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    A Spherical body moves with a uniform angular velocity 'w' around a circular path of radius 'r'. Which one of the following statements is correct ?
    Solutions
    The body has a radial acceleration w^2 r directed towards the centre of the path
  • Question 3/29
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    A circular path

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    A person stands at the middle point of a wooden ladder which starts slipping between a vertical wall and the floor of a room,while plane. The path traced by a person standing at the middle point of the slipping ladder is
    Solutions
    A circular path
  • Question 4/29
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    Equal to zero

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    A car is running on a road at a uniform speed of 60 km/hr. The net resultant force on the car is
    Solutions
    Equal to zero
  • Question 5/29
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    A is false but R is true

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    Assertion (A): The weight of a body decreases with the increase of latitude on earth.Reason (R): The earth is not a perfect sphere.
    Solutions
    A is false but R is true
  • Question 6/29
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    A is false but R is true

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    Assertion (A): In our houses, the current in A.C. electricity line changes direction 60 times per second.Reason (R): The frequency of alternating voltage supplied is 50 Hz.
    Solutions
    A is false but R is true
  • Question 7/29
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    Both A and R are true and R is the correct explanation of A

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    Assertion (A): A jet aircraft moving at Mach Mumber equal to 1 travels faster at an altiude of 15 km than while moving at Mach Number equal to 1 near the sea level. Reason (R): The velocity of sound depends on the temperature of the surrounding medium.
    Solutions
    Both A and R are true and R is the correct explanation of A
  • Question 8/29
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    Both A and R are true and R is the correct explanation of A

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    Assertion (A): In the visible spectrum of light,red light is more energetic than green light.Reason (R): The wavelength of red light is more than that of green light.
    Solutions
    Both A and R are true and R is the correct explanation of A
  • Question 9/29
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    Both A and R are true and R is the correct explanation of A

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    Assertion (A): Radio waves bend in a magnetic field.Reason (R): Radio waves are electromagnetic in nature.
    Solutions
    Both A and R are true and R is the correct explanation of A
  • Question 10/29
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    2 only

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    Consider the following statements: 1. A geostationary satellite is at an approximate height of 10000 km. 2. FM transmission of music is of very good quality because the atmospheric or      man-made noises which are generally frequent variations can do little harm. Which of the statements given above is/are correct ?
    Solutions
    2 only
  • Question 11/29
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    10^6 ohm

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    What is the order of magnitude of electric resistance of the human body (dry)
    Solutions
    10^6 ohm
  • Question 12/29
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    Theodore Maiman

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    Who among the following invented Lasers ?
    Solutions
    Theodore Maiman
  • Question 13/29
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    Wood

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    In which one among the following is the speed of sound maximum ?
    Solutions
    Wood
  • Question 14/29
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    6500 K

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    Which one of the following is printed on a commonly used fluorescent tubelight ?
    Solutions
    6500 K
  • Question 15/29
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    Noise reduction circuit

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    What does the term 'Dolby B' or'Dolby C' printed on tape recorders and other sound systems refer to ?
    Solutions
    Noise reduction circuit
  • Question 16/29
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    Both 1 and 2

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    1. If magenta and yellow coloured circles intersect, the intersected area will           have red colour. 2. If cyan and magenta coloured circles intersect,the intersected area will have      blue colour Which of the statements given above is/are correct ?
    Solutions
    Both 1 and 2
  • Question 17/29
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    2 only

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    Consider the following statements: 1. A flute of smaller length produces waves of lower frequecy. 2. Sound travels in rocks in the form of longitudinal elastic waves only. Which of the statements given above is/are correct ?
    Solutions
    2 only
  • Question 18/29
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    Earth and the sun

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    One Astronomical unit is the average distance between
    Solutions
    Earth and the sun
  • Question 19/29
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    Wire of 3 m length and 1.5 mm diameter

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    Four wires of some material and of dimensions as under are stretched by a load of same magnitude separately. Which one of them will be elongated maximum ?
    Solutions
    Wire of 3 m length and 1.5 mm diameter
  • Question 20/29
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    1,2 and 3

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    Consider the following statements : An ordinary light bulb has a rather short life because the 1. Filament wire is not unifrom 2. Bulb cannot be evacuated completely. 3. Wires supporting the filament melt at high temperature. Which of the above statements are correct ?
    Solutions
    1,2 and 3
  • Question 21/29
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    Leaf

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    Which one of the following parts of the pitcher plant becomes modified into a pitcher ?
    Solutions
    Leaf
  • Question 22/29
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    A-(1),B-(2),C-(3),D-(4)

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    Match List-I(Quantity ) with List-II (units)and select the correct answer using the codes given below the lists: List-I               List-II A. High speed      1. Mach B. Wavelength     2. Angstrom C. Pressure          3. Pascal D. Energy            4. Joule
    Solutions
    A-(1),B-(2),C-(3),D-(4)
  • Question 23/29
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    Rising of water from the roots of a plant to its foliage

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    For which of the following is the only reasons ?
    Solutions
    Rising of water from the roots of a plant to its foliage
  • Question 24/29
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    1 and 2

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    Consider the following statements: 1. If a persons looks at a coin which is in a bucket of water, the coin will appear    to be closer than it really is. 2. If a person under water looks at a coin above,the water surface,the coin will       appear to be at a higher level than it really is. Which of the above statements is/are correct ?
    Solutions
    1 and 2
  • Question 25/29
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    Interference

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    Endoscopy, a technique used to explore the stomach or other inner parts of the body is based on the phenomenon of
    Solutions
    Interference
  • Question 26/29
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    Radio Waves

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    Which one of the following does a TV remote control unit use to operate a TV set ?
    Solutions
    Radio Waves
  • Question 27/29
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    Noise from a machine -shop

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    A noise level of 100 decibels would correspond to
    Solutions
    Noise from a machine -shop
  • Question 28/29
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    Chokes low frequency currents

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    Fluorescent tubes are fitted with a choke.The choke coil
    Solutions
    Chokes low frequency currents
  • Question 29/29
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    Refraction,diffraction and transmission

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    When a CD(compact disc used in audio and video systems ) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of
    Solutions
    Refraction,diffraction and transmission
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