Home
Class 12
BIOLOGY
Fluorescence microscope I. used to det...

Fluorescence microscope
I. used to detect specific proteins or other molecules in cells and tissues.

II. Uses UV light with higher wavelength (3500-4000Å).
III. Is useful mainly for viewing highly ordered objects such as crystals.
IV. dependson changes in the speed of light for its functioning.

A

I and III

B

I and II

C

Only III

D

I and IV

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • CELL: THE UNIT OF LIFE

    ARIHANT NEET|Exercise Chapter Exercises B Medical entrances special format questions (Match the column)|4 Videos

  • CELL: THE UNIT OF LIFE

    ARIHANT NEET|Exercise Chapter Exercises B Medical entrances special format questions (Assertion and Reason )|8 Videos

  • CELL: THE UNIT OF LIFE

    ARIHANT NEET|Exercise Chapter Exercises A Taking it together (Assorted Questions of the Chapter for Advanced Level Practise )|135 Videos

  • CELL CYCLE AND CELL DIVISION

    ARIHANT NEET|Exercise Chapter Exercises (C) Medical entrances gallery (collection of questions asked in NEET & Various medical entrance exams)|63 Videos

  • CHEMICAL COORDINATION AND INTEGRATION

    ARIHANT NEET|Exercise MEDICAL ENTRANCES S GALLERY|100 Videos

Similar Questions

Explore conceptually related problems

Which of the following statement is/are true (A)The resolution power of unaided human eye is 100 micrometre (B) The highest resolution is obtained with the light of shortest wavelength (C ) Dark fiel microscope is most useful for viewing the living cells (D) In gel filtration chromatography, molecules can be separated in picogram to nanogram quantities

Which metal will be suitable for a photo electric cell using light of wavelength 4000 Å. The work functions of sodium and copper are respectively 2.0 eV and 4.0 eV.

Storng Tyndall effect is observed only when (i) the refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude (ii) the diameter of the dispersed particles is biggest than the wavelength of the light used (iii) the refractive indices of the dispersed phase and the dispersion medium are similar (iv) the diameter of the dispersed particles is not much smaller than the wavelength of the light used.

Read the paragraph and answer the questions given below it: Construction of a compound microscope : (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object) and the eyepiece (the lens directed toward the eye). Both thhe lenses are small in size, but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length. The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand. The principle axes of the objective lens and the eyepiece are along the same line. The distance between the object and the objective lens can be changed with a screw. It is possible to change the distance between the objective lens and the eyepiece. Working : (1) The object to be observed is illuminated and placed in front of the objective lens, slightly beyond the focal length of hte objective lens. Its real, invertes and enlarged image is formed by the objective lens on the other side. (2) This intermediate image lies within the focal length of the eyepiece. It serves as an object for the oyepiece. The oyepiece works as a simple micrroscope. The final image is virtual, highly enlarged and inverted with respect to the original object. It can be formed at the minimum distance of distinict vision from the eyepiece. The final image is observed by keeping the oye close to the eyepice. Use: This microscope is uded to observe blood cells, microorganisms, sec. State the use of a compound microscope.

Read the paragraph and answer the questions given below it: Construction of a compound microscope : (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object) and the eyepiece (the lens directed toward the eye). Both thhe lenses are small in size, but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length. The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand. The principle axes of the objective lens and the eyepiece are along the same line. The distance between the object and the objective lens can be changed with a screw. It is possible to change the distance between the objective lens and the eyepiece. Working : (1) The object to be observed is illuminated and placed in front of the objective lens, slightly beyond the focal length of hte objective lens. Its real, invertes and enlarged image is formed by the objective lens on the other side. (2) This intermediate image lies within the focal length of the eyepiece. It serves as an object for the oyepiece. The oyepiece works as a simple micrroscope. The final image is virtual, highly enlarged and inverted with respect to the original object. It can be formed at the minimum distance of distinict vision from the eyepiece. The final image is observed by keeping the oye close to the eyepice. Use: This microscope is uded to observe blood cells, microorganisms, sec. Where fo you place the object to be observed with a compound microscope ?

Read the paragraph and answer the questions given below it: Construction of a compound microscope : (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object) and the eyepiece (the lens directed toward the eye). Both thhe lenses are small in size, but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length. The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand. The principle axes of the objective lens and the eyepiece are along the same line. The distance between the object and the objective lens can be changed with a screw. It is possible to change the distance between the objective lens and the eyepiece. Working : (1) The object to be observed is illuminated and placed in front of the objective lens, slightly beyond the focal length of hte objective lens. Its real, invertes and enlarged image is formed by the objective lens on the other side. (2) This intermediate image lies within the focal length of the eyepiece. It serves as an object for the oyepiece. The oyepiece works as a simple micrroscope. The final image is virtual, highly enlarged and inverted with respect to the original object. It can be formed at the minimum distance of distinict vision from the eyepiece. The final image is observed by keeping the oye close to the eyepice. Use: This microscope is uded to observe blood cells, microorganisms, sec. State the nature of the final image in a compound microscope relative to the object.

Read the paragraph and answer the questions given below it: Construction of a compound microscope : (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object) and the eyepiece (the lens directed toward the eye). Both thhe lenses are small in size, but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length. The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand. The principle axes of the objective lens and the eyepiece are along the same line. The distance between the object and the objective lens can be changed with a screw. It is possible to change the distance between the objective lens and the eyepiece. Working : (1) The object to be observed is illuminated and placed in front of the objective lens, slightly beyond the focal length of hte objective lens. Its real, invertes and enlarged image is formed by the objective lens on the other side. (2) This intermediate image lies within the focal length of the eyepiece. It serves as an object for the oyepiece. The oyepiece works as a simple micrroscope. The final image is virtual, highly enlarged and inverted with respect to the original object. It can be formed at the minimum distance of distinict vision from the eyepiece. The final image is observed by keeping the oye close to the eyepice. Use: This microscope is uded to observe blood cells, microorganisms, sec. State which distance is adjusted to observe the object with a compound microscope.

Direction : Resistive force proportional to object velocity At low speeds, the resistive force acting on an object that is moving a viscous medium is effectively modeleld as being proportional to the object velocity. The mathematical representation of the resistive force can be expressed as R = -bv Where v is the velocity of the object and b is a positive constant that depends onthe properties of the medium and on the shape and dimensions of the object. The negative sign represents the fact that the resistance froce is opposite to the velocity. Consider a sphere of mass m released frm rest in a liquid. Assuming that the only forces acting on the spheres are the resistive froce R and the weight mg, we can describe its motion using Newton's second law. though the buoyant force is also acting on the submerged object the force is constant and effect of this force be modeled by changing the apparent weight of the sphere by a constant froce, so we can ignore it here. Thus mg - bv = m (dv)/(dt) rArr (dv)/(dt) = g - (b)/(m) v Solving the equation v = (mg)/(b) (1- e^(-bt//m)) where e=2.71 is the base of the natural logarithm The acceleration becomes zero when the increasing resistive force eventually the weight. At this point, the object reaches its terminals speed v_(1) and then on it continues to move with zero acceleration mg - b_(T) =0 rArr m_(T) = (mg)/(b) Hence v = v_(T) (1-e^((vt)/(m))) In an experimental set-up four objects I,II,III,IV were released in same liquid. Using the data collected for the subsequent motions value of constant b were calculated. Respective data are shown in table. {:("Object",I,II,II,IV),("Mass (in kg.)",1,2,3,4),(underset("in (N-s)/m")("Constant b"),3.7,1.4,1.4,2.8):} If an object of mass 2 kg and constant b = 4 (N-s)/(m) has terminal speed v_(T) in a liquid then time required to reach 0.63 v_(T) from start of the motion is :

ARIHANT NEET-CELL: THE UNIT OF LIFE-Chapter Exercises B Medical entrances special format questions (Statement Based Question)
  1. The factors, which influence membrane fluidity are I. cholesterol ...

    Text Solution

    |

  2. Which of the following are correct for inner mitochondrial membrane? ...

    Text Solution

    |

  3. The chloroplasts are believed to be bacterial endosymbionts because ...

    Text Solution

    |

  4. Endoplasmic reticulum I. provides additional mechanical support to t...

    Text Solution

    |

  5. Which of the following are cell inclusions? I. Aleurone grains II....

    Text Solution

    |

  6. Read the following statements and choose the option with all correct s...

    Text Solution

    |

  7. Cosider the following statement and choose the correct ones. I. Yolk...

    Text Solution

    |

  8. Read the followig statements regarding microbodies and choose the inco...

    Text Solution

    |

  9. Which of the following statements are correct for the transmission ele...

    Text Solution

    |

  10. Chromatography I. is employed for separation of constituents of mixt...

    Text Solution

    |

  11. Cell fractionation involves I. homogenisation of cell constituents. ...

    Text Solution

    |

  12. Fluorescence microscope I. used to detect specific proteins or other...

    Text Solution

    |

  13. The chromosomes which do not take part in cell division are I. L-chr...

    Text Solution

    |

  14. Which of the following are used to define the karyotype of a species ...

    Text Solution

    |

  15. Which of the following statement(s) is/are incorrect regarding the ban...

    Text Solution

    |

  16. Different cells have different sizes. Arrange the following in an asce...

    Text Solution

    |