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Recently added practice questions

6701. Phthalic anhydride is produced by the oxidation of _________________?
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A. Aniline

B. Benzene

C. Naphthalene

D. Toluene

6702. Photosystem II has molecules which absorbs maximum light of___________?
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A. 680 nm

B. 700 nm

C. 100 m

D. 670 nm

6703. Photon of highest frequency will be absorbed when transition takes place from_____________?
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A. 4th to 5th orbit

B. 1st to 5th orbit

C. 3rd to 5th orbit

D. 2nd to 5th orbit

6704. Photocopier and inject printer are dealt in________________?
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A. Charges in motion

B. Capacitors

C. Electrostatics

D. Electric fields

6705. Photochemical reaction rate does not depend significantly on temperature, because____________________?
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A. None of these

B. It is a reversible reaction

C. The energy of reacting molecules exceeds the activation energy by absorption of light

D. It is an exothermic reaction

6706. Phosphorus is an essential component of one of the following biological molecules:
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A. None

B. Nucleic acids

C. Carbohydrates

D. Amino acids

6707. Phosphorus deficiency is widespread in most (_____%) 0f the soils of Pakistan.
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A. 32%

B. 68%

C. 54%

D. 90%

6708. Phosphorus (P) is the second major nutrient essential for plant growth. With the exception of Nitrogen (N) and Potassium (K), Phosphorus is required by plants in_________?
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A. Lesser quantities

B. Greater quantities

C. The above statement is wrong

D. Not required

6709. Phosphoric acid is a weak acid and its basicity is____________________?
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A. 3

B. 2

C. zero

D. 1

6710. Phonemes which effect meaning change in the same linguistic environment are said to be in ____________?
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A. None of the abovE.

B. Complementary distribution

C. Contrastive distribution

D. Non__contrastive distribution

6711. Phoenix dactylifera belongs to the family___________________?
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A. Palmeae

B. Anacardiaceae

C. Rutaceae

D. Pomaceae

6712. Phillis Wheatleys poetry is considered_____________?
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A. Highly original.

B. Typical of Colonial poetry.

C. Abolitionist in subject.

D. Progressive and challenging.

6713. Phenomenon in which porcelain appears different under varying light condition is______________?
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A. Opacification

B. Refractive optics

C. Translucency

D. Metamerism
6714. Phenols are added in gasoline to____________________?
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A. Act as an antioxidant

B. Increase its pour point

C. Improve the octane number

D. Reduce its viscosity

6715. Phenol was isolated by Runge from________________?
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A. wood

B. none of these

C. coaltar

D. vegetable oil

6716. Phenol is mainly used____________________?
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A. To produce phenol formaldehyde

B. To produce polyester resin

C. To produce benzene

D. As a plasticiser for unsaturated polyester

6717. Phase contrast microscopy is based on principle of__________________?
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A. Light attenuation

B. Different reflective indices of object

C. Light scattering

D. Different refractive indices of object
6718. Phase contrast microscopy is based on principle of__________________?
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A. Different refractive indices of object

B. Light attenuation

C. Light scattering

D. Different reflective indices of object

6719. Pharyngeal phase of deglutition_____________?
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A. A and B

B. Vocal cords are closed

C. Is a reflex mechanism

D. Is a voluntary mechanism

6720. Phagocytes kill bacteria through which mechanism_____________?
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A. Chemotaxis

B. Membrane attack complex killing

C. Oxidative and non-oxidative killing

D. Zipper killing

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