PMC Practice Test 3 2021

In the process of esterification, -OH is derived from?

Muscle contraction depends on:

How does each photoexcited electron pass from PS2 to PS1?

Which of the following is the most widely accepted theory for the ascent of sap?

What event occurs in the menstrual cycle when the level of progesterone declines?

Photosystems are located in the ___________.

During inspiration, the diaphragm:

Antibodies play an important role in fighting microorganisms and other pathogens. To which type of protein do they belong?

The complete breakdown of glucose molecules takes place in which of the following?

What are the animals that have features of both mammals and reptiles?

Which of the following results from conjugation in Paramecium?

If the non-protien part is loosely attached to the protein part in the enzyme, it is known as:

__________ are among the smallest known viruses.

Which of the following movements are possible in a pivot joint?

The part of the spinal cord where interneurons are present is called:

This is a reduced compound:

A structural component that is found in all viruses is?

What happens during muscle contraction to the length of each myosin and actin filament?

Lymphocytes are found in the:

The presence of peptidoglycan in gram-positive bacteria is:

Which of the following genetic diseases is caused by mutations in a membrane protein?

The path of electrons through the two photosystems is called:

These are the properties of lipids:

Which of the following structures provides greater pathogenicity to the bacteria?

Synaptic vesicles discharge which hormone at the neuromuscular junction?

Glycophorin is involved in which of the following diseases?

What is the property of the part of a cell membrane that is in contact with the external and internal environment?

The set of all genes in any population is termed as:

In reproduction, semen refers to which of the following?

The thalamus and the hypothalamus are located in which region of the brain?

Which of the following changes length during sarcomere contraction?

Which of these is not a reflex action?

Which of the following is an example of a marine annelid?

Which of the following conditions is not required to be true for a population in the Hardy-Weinberg equilibrium?

The enzyme which plays an important role in HIV pathogenesis:

The cell organelles involved, in some cases, in extra-cellular digestion are _____________.

The period during which a girl sexually matures is called _____.

Structures that were once functional in the past but no longer serve a purpose due to evolutionary adaptations and physiological changes are referred to as:

Which of the following is paired correctly?

Which one of the following is a non-protein group covalently bonded to a few respiratory enzymes, among others?

In all plants, the major sites of photosynthesis are:

The protein coat of a virus enclosing nucleic acid is called the:

This group of animals has three bones in the ear:

The frequency of an allele, if it is evolutionary successful, is?

A monohybrid cross yielded a 3:1 ratio in F2. What could be the mode of inheritance?

Which was the first virus to be successfully crystallized?

In which class of the phylum Mollusca is the octopus included?

Urethra and vagina have _____ openings to the exterior.

Enzymes for light-dependent reactions of photosynthesis would most likely be associated with:

Which of the following is true about both bacterial conjugation and meiosis?

To produce ATP (adenosine triphosphate) in muscles, creatine phosphate (CP) transfers __________ to adenosine diphosphate (ADP).

Smooth endoplasmic reticulum is abundant in which types of cells?

The spinal cord consists of which type of cell body?

The animals in which there are separate male and female individuals are called?

Which of the following is not evidence of evolution?

Cytochromes are electron transport intermediates containing?

When was the Tobacco mosaic virus successfully crystalized?

The electron transport chain in plants consists of an electron carrier called?

Which of the following statements about the systemic effect of bacterial cells is true?

Assymetrical body is a feature of phylum _______________.

The loss of water from the aerial parts of the plant is known as:

In enzymatic mechanism, the substrate bind to the enzyme active site to produce?

Two pea plants are crossed. One plant is homozygous dominant for purple flowers, and the other is homozygous recessive for white flowers. What fraction of the F2 population will have white flowers?

The T-lymphocytes and B-lymphocytes are the major cells of the:

Which of the following is the respiratory surface in human beings?

The patellar reflex and the Achilles reflex are examples of:

A condition with abnormal amount of fats is called?

Which of the following acid solutions is used for the seasoning of food?

There are just a few stable compounds formed by noble gases, like:

Shifting the position of equilibrium can be used to increase:

In an exothermic reaction (reversible), which of the following has a positive value?

The properties of liquid crystals are intermediate between crystals and:

Carboxylic acids are formed by the hydrolysis of ________.

Plasma, the fourth state of matter, was identified by:

Fractions of crude petroleum can be obtained by using ___________.

The oxidation number of Nickel in [Ni(CO)]₄] is:

The biochemical process used in the synthesis of alcohol in the presence of yeast is called ___________.

The first member of alkynes is called ___________.

In the production of wrought iron, Mg, Si, and P are removed in the form of:

Carboxylic acids form dimers due to _________.

Who attributed the deviation of real gases from ideal behavior?

Polymerization of ethene produces which of the following polymers?

Which of the species has a permanent dipole moment?

Redox reactions actually transfer:

An electron in an atom is completely described by its:

Fluorine has the highest electronegativity value, which is:

What is the coordination number of Pt in [PtCl(NO2)(NH3)4]?

Metals look shiny as light falling on metal surfaces collides with mobile electrons and makes them _____. These electrons then give out light when they are _____.

BH3 has H-B-H bond angles of 120 with geometry as:

If the pressure and volume of a gas are variable while the temperature remains constant, this belongs to:

During the course of a SN1 reaction, the intermediate species formed is:

Acetaldehyde undergoes polymerization with concentrated H2SO4 to form _______.

The alcohols which are resistant to oxidation reactions are:

A compound has an empirical formula, C2H2O. If the experimental molecular weight is found to be in the range of 160–170, the molecular formula of this compound is: (Atomic weight: C = 12.1, H = 1, O = 16).

An aromatic compound that cannot be obtained from coal tar is:

Which of the following is not a mixture of hydrocarbons?

Which of the following elements is not usually present in all proteins?

SN1 reactions are favored by which of the following reactions?

The activator of the phosphatase enzyme is _________.

If the concentration of reactants in a chemical reaction is unity, then the rate is called:

Dipole forces have a direct relationship with the ________.

Enzymes speed up the reaction up to:

Instantaneous rate of reaction is at:

Cholesteryl Benzoate turns milky at:

Which reaction will need maximum energy to remove its one electron?

S-S bond is present in which of the ion pairs?

Standard electrode potential is represented as follows:

Why is phenol more acidic than Alcohol?

Which one of the following structures does the benzene molecule have?

In proteins, the hydrogen-bonding is present between ________.

Which of the following centers are present in the carbonyl compounds?

Which type of carboxylic acid is produced from the hydrolysis of nitriles?

The quantum number values for 2p orbitals are:

Limiting reactant controls the amount of _____.

Cyclic compounds consists of all of the following except:

A liquid crystalline state exists between two temperatures (the melting temperature and the ______ temperature).

What does the reaction of vinyl acetylene with HCl produce?

Reduction of alkyl halides in the presence of Zn and mineral acid produces ________.

The number of charges present on a cation depends on the number of electrons __________ by the atom.

Enzymes are _____ in nature.

In aldol condensation, the nucleophile is ________.

The critical temperature of ammonia isoC:

Which of the following statements is incorrect about amorphous solids?

If the engine is supposed to work between 727°C and 227°C, then the maximum possible efficiency is:

Woolen clothes keep the body warm because of:

The correct form of Ohm's law is:

What is the power of a bulb if it is operated at 220 volts and the current in the circuit is 1.5 amps?

Which of the following is different for isotopes?

Which statement is incorrect?

If we are moving with a constant velocity frame, then the inertial state is the same as:

The open-circuit test in a transformer is used to measure:

Identify the factor on which mutual inductance does not depend:

What is electrostatic force?

A stationary wave is set up on a string of length 10 cm. Four loops are formed. What is the distance between two consecutive crests?

The rectifier is a device that converts:

Protons and neutrons are composed of smaller particles called:

In a spectrometer, the circular scale, graduated by half a degree, is attached with:

If a proton, alpha particle, and photon moving with the same velocity enter a uniform magnetic field, then which particle will deflect more?

A cyclist comes to a skidding stop at 10 m. During this process, the force on the cycle due to the road is 200 N and is directly opposed to the motion. How much work does the road do on the bicycle? How much work does the bicycle do on the road?

A relationship exists between current and voltage in terms of Ohm's law.

The electron volt is the unit of _____.

The effect of work done is equal to

If the instantaneous current in a circuit is given by I = A sin (wt) ampere, the RMS value of the current is:

When an object is moving at constant speed, which of the following is always true?

The use of a capacitor filter in a rectifier circuit gives satisfactory performance only when the load:

When the bulb is turned on, Ohm's law is applicable:

A wave passes through a medium; each particle of the medium performs 100 complete vibrations in 5 seconds. What is the frequency of the wave?

What force provides the centripetal force for planets moving around the sun?

The frequency of the applied AC is 2 kHz. Its time period will be:

When a spring is stretched, how much work is done by the stretching force?

The negative of the potential gradient is equal to:

Motional emf can be produced with:

The maximum efficiency of a half-wave rectifier is:

A galvanometer acting as a voltmeter will have a coil with:

A beam of electrons can:

The centripetal force is zero when the centrifugal force is:

A 100-watt heater is used for 5 minutes to heat some water from 20 °C to 50°C. What is the mass of water that is heated? The specific heat capacity of water is 4.2 J/g°C.

A pendulum undergoes simple harmonic motion. The phase difference between the displacement and the acceleration of the particle is:

The oscillating object overshoots the rest position due to:

Velocity is a:

Which of the following frequencies of sound waves is audible?

An air pipe is open at one end. A stationary wave is produced in second-harmonic mode. What is the phase difference between the motion of the particles at the closed end of the pipe and at the centre of the pipe?

The activity of a radioactive substance changes from 8000 Bq to 1000 Bq in 12 days. What is the half-life of the radioactive substance?

The source of gamma radiation is:

An object is displaced from point A (0, 1, 1) m to point B (1, 4, 3) m under a constant force F = (i + 2j + 3k). Find the work done by this force in this process:

The black body always _______ radiation.

An electrical instrument that is used to measure the potential difference between two points is called the:

The value of the universal gas constant, R, is _____?

What is the maximum electron energy in a neutron beta-decay?

What does the term 'coherent source of light' mean?

A loop of radius 1 m is placed on an incline of 60 degree with a magnetic field of 100 T. The corresponding flux will be:

A cubic vessel of height 1 m is full of water. The minimum work done in taking the water out is:

The frequency of a traveling wave is 2000 Hz. Its speed is 300m/s. What is its wavelength?

Mass m1 has a velocity of 0 m/s and mass m2 has a velocity of 5 m/s; m1>m2. Which one has a larger interior?

Two identical gases expand:i) Isothermallyii) AdiabaticallyWork done is more in the:

Which of the following is made up of more neutrons than protons?

You have three capacitors, each of 2 C. In which of the following combinations of the three capacitors is the resultant capacitance 6 C?

If the clouds of the Earth behave like a black body, what will happen?

As the mass number increases, which of the following does not change?

Thank you. You've been very _______ through this time.

Choose the correct type of tense: "We will visit the museum."

Either my father or my brothers __________ going to sell the car.

Choose the correct sentence:

The sun ___________ (shine) brightly.

I have already got a ____________ at a hotel in Murree. We shall have no problems.

Either my mother or my father _____________ coming to the meeting.

Select the option which fits appropriately in the blank:_____ icon like this is called _______ hourglass.

"What are you doing here?" " I __________________ TV."

Choose the correct spelling of the word:

Select words that describe the word: Glared

Select the nearest correct meaning of the word: 'Unburdened'.

Find the error in the following options:

Choose the incorrect portion from the given statement.The students were awaiting for the arrival of the chief guest.

It ____________ (rain) since last night.

I borrowed ________ pencil from your pile of pencils and pens.

_________ people know the town better than old Jake here.

Did I say anything to make you angry?What type of sentence it is?

We still haven't come __________ with an interesting theme for the advertising campaign.

Mariam enjoys eating ___________ cheese.

Statement:I. Police resorted to lathi-charge to disperse the unlawful gathering of large number of people.II. The citizens' forum called a general strike in protest against the police atrocities.

A book cannot exist without?

CMM, EOO, GQQ, _____, KUU

Statements:I. The literacy rate in the district has been increasing for the last four years.II. The district administration has conducted an extensive training program for the workers involved in the literacy drive.

Look at these series: 14, 28, 20, 40, 32, and 64. What number should come next?

Discernible and Palpable have _________ letters in common.

Statement:The availability of imported fruits has increased in the indigenous market and so the demand for indigenous fruits has been decreased.Courses of Action:I. To help the indigenous producers of fruits, the Government should impose a high import duty on these fruits, even if they are not of good quality.II. The fruit vendors should stop selling imported fruits. So that the demand for indigenous fruits would increase.

StatementThe availability of imported fruits has increased in the indigenous market, and so the demand for indigenous fruits has decreased.ConclusionsI. To help the indigenous producers of fruits, the Government should impose a high import duty on these fruits, even if they are not of good quality.II. The fruit vendors should stop selling imported fruits. So that the demand for indigenous fruits would increase.

How many such pairs of letters are there in the word 'HISTORICAL' that have as many letters between them in the word as they have between them in the English alphabet?

Statement:I. There has been a decline in the prices of personal computers.II. School going kids are expressing interests in learning how the computer operates.