NEET 2018 – PYQ Practice

The magnetic potential energy stored in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This inductor is of inductance

If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct?

An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is

A battery consists of a variable number n of identical cells (having internal resistance r each) which are connected in series. The terminals of the battery are short-circuited and the current I is measured. Which of the graphs shows the correct relationship between I and n?

A moving block having mass m, collides with another stationary block having mass 4m. The lighter block comes to rest after collision. When the initial velocity of the lighter block is v, then the value of coefficient of restitution (e) will be

The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is

The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is

A set of n equal resistors, of value R each, are connected in series to a battery of emf E and internal resistance R. The current drawn is I. Now, the n resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10I. The value of n is

The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is

Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is

An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of

An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be

In a p-n junction diode, change in temperature due to heating

The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe is

A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of –0.004 cm, the correct diameter of the ball is

Which one of the following statements is incorrect?

A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from

A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere?

A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27°C two successive resonances are produced at 20 cm and 73 cm of column length. If the frequency of the tuning fork is 320 Hz, the velocity of sound in air at 27°C is

A small sphere of radius ‘r’ falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity, is proportional to

The difference between amylose and amylopectin is

In which case is number of molecules of water maximum?

Which one is a wrong statement?

The correct order of N-compounds in its decreasing order of oxidation states is

When initial concentration of the reactant is doubled, the half-life period of a zero order reaction

The correct order of atomic radii in group 13 elements is

Nitration of aniline in strong acidic medium also gives m-nitroaniline because

Which of the following compounds can form a zwitter ion?

Which of the following statements is not true for halogens?

Which one of the following ions exhibits d-d transition and paramagnetism as well?

Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their

Which of the following carbocations is expected to be most stable?

Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is

Which of the following oxides is most acidic in nature?

The correct difference between first and second order reactions is that

What type of ecological pyramid would be obtained with the following data? Secondary consumer : 120 g Primary consumer : 60 g Primary producer : 10 g

All of the following are included in ‘ex-situ conservation’ except

Pollen grains can be stored for several years in liquid nitrogen having a temperature of

Natality refers to

In a growing population of a country,

Which of the following hormones can play a significant role in osteoporosis?

Which of these statements is incorrect?

Nissl’s bodies are mainly composed of

Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively?

Casparian strips occur in

Plants having little or no secondary growth are

Which of the following events does not occur in rough endoplasmic reticulum?

Which of the following is an occupational respiratory disorder?

Select the wrong statement.

Oxygen is not produced during photosynthesis by

Which of the following organisms are known as chief producers in the oceans?

Sweet potato is a modified

Calcium is important in skeletal muscle contraction because it

After karyogamy followed by meiosis, spores are produced exogenously in

The stage during which separation of the paired homologous chromosomes begins is

Which of the following structures or regions is incorrectly paired with its functions?

Which of the following features is used to identify a male cockroach from a female cockroach?

Which of the following is an amino acid derived hormone?

Ciliates differ from all other protozoans in

Stomata in grass leaf are

Which of the following statements is correct?

Identify the vertebrate group of animals characterised by crop and gizzard in its digestive system.

Which one of these animals is not a homeotherm?

Which of the following is true for nucleolus?

Which among the following is not a prokaryote?

Which one is wrongly matched?

The Golgi complex participates in

Secondary xylem and phloem in dicot stem are produced by

Select the incorrect match.

The two functional groups characteristic of sugars are

Which of the following is not a product of light reaction of photosynthesis?

Which of the following has proved helpful in preserving pollen as fossils?

The similarity of bone structure in the forelimbs of many vertebrates is an example of

AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?

According to Hugo de Vries, the mechanism of evolution is

In India, the organisation responsible for assessing the safety of introducing genetically modified organisms for public use is

A 'new' variety of rice was patented by a foreign company, though such varieties have been present in India for a long time. This is related to

Among the following sets of examples for divergent evolution, select the incorrect option.

Which of the following pairs is wrongly matched?

The amnion of mammalian embryo is derived from

The correct order of steps in Polymerase Chain Reaction (PCR) is

Pneumatophores occur in

Use of bioresources by multinational companies and organisations without authorisation from the concerned country and its people is called

Select the correct statement :

Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?

All of the following are part of an operon except

Double fertilization is

Which of the following characteristics represent 'Inheritance of blood groups' in humans? a. Dominance b. Co-dominance c. Multiple allele d. Incomplete dominance e. Polygenic inheritance

Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as

Which of the following is not an autoimmune disease?

Winged pollen grains are present in

The experimental proof for semi-conservative replication of DNA was first shown in a

Which one of the following population interactions is widely used in medical science for the production of antibiotics?

Select the correct match :

Which of the following animals does not undergo metamorphosis?

Which part of poppy plant is used to obtain the drug “smack”?

Niche is

The contraceptive ‘Saheli’

Select the correct match :

In which disease does mosquito transmitted pathogen cause chronic inflammation of lymphatic vessels?

Hormones secreted by the placenta to maintain pregnancy are

The difference between spermiogenesis and spermiation is

Conversion of milk to curd improves its nutritional value by increasing the amount of

Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes?

A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by