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The venturi-meter works on:
An open-ended U-tube of uniform cross-sectional area contains water (density 1.0 gram/centimeter3) standing initially 20 centimeters from the bottom in each arm. An immiscible liquid of density 4.0 grams/centimeter3 is added to one arm until a layer 5 centimeters high forms, as shown in the figure above. What is the ratio h2/h1 of the heights of the liquid in the two arms ?
A fluid container is containing a liquid of density r is is accelerating upward with acceleration a along the inclined place of inclination a as shwon. Then the angle of inclination q of free surface is:
Figure shows a three arm tube in which a liquid is filled upto levels of height l. It is now rotated at an angular frequency w about an axis passing through arm B. The angular frequency w at which level of liquid of arm B becomes zero.
A metal ball of density 7800 kg/m3 is suspected to have a large number of cavities. It weighs 9.8 kg when weighed directly on a balance and 1.5 kg less when immersed in water. The fraction by volume of the cavities in the metal ball is approximately:
A rectangular tank is placed on a horizontal ground and is filled with water to a height H above the base. A small hole is made on one vertical side at a depth D below the level of the water in the tank. The distance x from the bottom of the tank at which the water jet from the tank will hit the ground is
A cylindrical block of area of cross-section A and of material of density r is placed in a liquid of density one-third of density of block. The block compresses a spring and compression in the spring is one-third of the length of the block. If acceleration due to gravity is g, the spring constant of the spring is
A sphere of radius R and made of material of relative density s has a concentric cavity of radius r. It just floats when placed in a tank full of water. The value of the ratio R/r will be
Two copper vessels A and B have the same base area but of different shapes. A takes twice the volume of water as that B requires to fill upto a particular common height. Then the correct statement among the following is:
Let a wire be suspended from the ceiling (rigid support) and stretched by a weight W attached at its free end. The longitudinal stress at any point of cross-sectional area A of the wire is:
The terminal velocity of a copper ball of radius 5 mm falling through a tank of oil at room temperature is 10 cm s-1. If the viscosity of oil at room temperature is 0.9 kg m-1 s-1, the viscous drag force is:
If a soap bubble expands, the pressure inside the bubble
A spherical ball is dropped in a long column of a highly viscous liquid. The curve in the graph shown, which represents the speed of the ball (v) as a function of time (t) is
Read the assertion and reason carefully to mark the correct option out of the options given below:
Assertion: Young's modulus for a perfectly plastic body is zero.
Reason: For a perfectly plastic body, restoring force is zero.
Assertion: Stress is the internal force per unit area of a body.
Reason: Rubber is less elastic than steel.
A steel rod 2.0 m long has a cross-sectional area of 0.30 cm2 . It is hung by one end from a support, and a 550-kg milling machine is hung from its other end. Determine the resulting strain. Young's Modulus of Steel (Y) = 20×1010 Pa
A piece of copper having a rectangular cross-section of 15.2 mm × 19.1 mm is pulled in tension with 44,500 N force, producing only elastic deformation. Calculate the resulting strain? Take Young's modulus of copper as 42 × 109Pa
What diameter should a 10-m-long steel wire have if we do not want it to stretch more than 0.5 cm under a tension of 940 N? Take Young's modulus of steel as 20 × 1010 Pa
A 200-kg load is hung on a wire with a length of 4.00 m, a cross-sectional area of 0.200 × 10−4 m2, and a Young’s modulus of 8.00 × 1010N/ m2. What is its increase in length?
If the elastic limit of copper is 1.5 × 108 N/ m2, determine the minimum diameter a copper wire can have under a load of 10.0 kg if its elastic limit is not to be exceeded.
A circular steel wire 2.00 m long must stretch no more than 0.25 cm when a tensile force of 400 N is applied to each end of the wire. What minimum diameter is required for the wire?
A garden sprinkler has 150 small holes, each of 2 mm2 area. If water is supplied at the rate of 0.3 litres/s, then find the average velocity of the spray.
If pressure at half the depth of a lake is equal to 2/3 pressure at the bottom of the lake then what is the depth of the lake
An inverted bell lying at the bottom of a lake 47.6 m deep has 50 cm of air trapped in it. The bell is brought to the surface of the lake. The volume of the trapped air will be (atmospheric pressure = 70 cm of Hg and density of Hg = 13.6 g/cm)
If two liquids of same masses but densities ρ1 and ρ2 respectively are mixed, then density of mixture is given by
A hemispherical bowl just floats without sinking in a liquid of density 1.2 x 10 kg/m. If outer diameter and the density of the bowl are 1 m and 2 x 10 kg/m respectively, then the inner diameter of the bowl will be
A ball whose density is 0.4 x 10 kg/m falls into water from a height of 9 cm. To what depth does the ball sink
Two solids A and B float in water. It is observed that A floats with 1/2 of its body immersed in water and B floats with 1/4 of its volume above the water level. The ratio of the density of A to that of B is
A manometer connected to a closed tap reads 3.5 × 10 N/m. When the valve is opened, the reading of manometer falls to 3.0 × 10 N/m, then velocity of flow of water is
A large tank filled with water to a height 'h' is to be emptied through a small hole at the bottom. The ratio of time taken for the level of water to fall from h to h/2 and from h/2 to zero is
A ball of radius r and density ρ falls freely under gravity through a distance h before entering water. Velocity of ball does not change even on entering water.
If viscosity of water is η, the value of h is given by
The rate of steady volume flow of water through a capillary tube of length / and radius 'r' under a pressure difference of P is V. This tube is connected with another tube of the same length but half the radius in series. Then the rate of steady volume flow through them is (The pressure difference across the combination is P)
A liquid is flowing in a horizontal uniform capillary tube under a constant pressure difference P. The value of pressure for which the rate of flow of the liquid is doubled when the radius and length both are doubled is
A constant volume gas thermometer shows pressure reading of 50cm and 90cm of mercury at 0°C and 100° C respectively. When the pressure reading is 60 cm of mercury, the temperature is
A constant pressure air thermometer gave a reading of 47.5 units of volume when immersed in ice cold water, and 67 units in a boiling liquids. The boiling point of the liquid will be
Two spheres made of same substance have diameters in the ratio 1: 2. Their thermal capacities are in the ratio of
Work done in converting one gram of ice at -10°C into steam at 100° C is
2gm of steam condenses when passed through 40gm of water initially at 25°C. The condensation of steam raises the temperature of water to 54.3°C. What is the latent heat of steam
Three liquids with masses M1, M2, M3 are thoroughly mixed. If their specific heats are C1, C2, C3 and their temperatures T1, T2, T3 respectively, then the temperature of the mixture is
The apparent coefficient of expansion of a liquid when heated in a copper vessel is Cand when heated in a silver vessel is S. If A is the linear coefficient of expansion of copper, then the linear coefficient of expansion of silver is
Four cylindrical rods of different radii and lengths are used to connect two heat reservoirs at fixed temperatures t1 and t2 respectively. From the following pick out the rod which will conduct the maximum quantity of heat:
The temperature for which the reading on Celsius and Fahrenheit scales are identical is
A steel tape is calibrated at 20° C. A piece of wood is being measured by steel tape at 10°C and reading is 30 cm on the tape. The real length of the wood is:
Which phase of matter has maximum value of temperature coefficient of cubical expansion?
The coefficient of liner expansion of a cubical crystal along three mutually perpendicular direction is α1 α2 and α3. What is the coefficient of cubical expansion of crystal?
In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Rate of reaction doubles when concentration of reactant is doubled if it is a first order reaction.
Reason (R): Rate constant also doubles.
Assertion (A): Hydrolysis of an ester follows first order kinetics.
Reason (R): Concentration of water remains nearly constant during the course of the reaction.
A foreign substance that increase the speed of a chemical reaction is called
What will be the value of instantaneous rate of reaction from the graph?
The rate of a chemical reaction doubles for every 10°C rise of temperature. If the temperature is raised by 50°C, the rate of the reaction increases by about
Chemical substances speeding up rate of chemical reaction is called as
Chemical substances speeding up the rate of chemical reaction is called as
The rate constant of zero-order reactions has the unit
For the reaction A + B → C+ D . The variation of the concentration of the products is given by curve
A tetra atomic molecule (A) on reaction with nitrogen (I) oxide, produces two substances (B) and (C) ,(B) is a dehyderating agent in its monometric form while substance (C) is a diatomic gas which shows almost intert behavior. The substances (A) and (B) and (C) respectively will be
First compound of intert gases was prepared by scientist Neil Barthleta in 1962. This compound is
Carbon give has X% of CO2 and is used as an antidote for poisoning of Y. Then, X and Y are
The correct order of acidic strength of oxide of nitrogen is
Nitrogen dioxide is dissolved in water to produce
Consider two reactions
I. Zn + conc. HNO3 (hot) → Zn(NO3)2 + X + H2O
II. Zn + dil. HNO3 (cold) → Zn(NO3)2 + Y + H2O
Compounds X and Y are respectively
it T1 < T2 ten X and Y respectively are
Boron forms BX3 type of halides. The correct increasing order of Lewis - acid strength of these halides is
The rate constant (k) of a reaction is measured at different temperatures (T), and the data is plotted in the given figure. The activation energy of the reaction in kJ mol-1 is (R is gas constant)
In a chemical reaction, if a linear (y = mx) graph is obtained between half-life and concentration of reactants, then what is the order of the reaction?
The rate constant of reaction A → 2B is 1.0 × 10-3 mol L-1 min-1. If the initial concentration of A is 1.0 mol L-1, then what is the concentration of B after 100 minutes?
The reaction 2N2O5(g) → 4 NO2(g) + O2(g) provides a linear plot when ln PN2O5 is plotted against t with a negative slope. The decomposition of N2O5 follows
For a first-order reaction, the ratio of times to complete 99.9% and half of the reaction is
For a first-order reaction,
The half-life of a zero-order reaction A → B is
For a non-stoichiometric reaction 2A + B → C + D, the following kinetic data was obtained in three separate experiments, all at 298 K:
The tribasic acid is
The most stable allotropic form of phosphorus, which has graphite like structure and is good conductor of electricity, is
The pair of products formed during the reaction of yellow phosphorous with aqueous potash solution is
Statement (I) - The order of densities of the various allotropes of phosphorous is: Black phosphorous > red phosphorous > white phosphorous.
Statement (II) - The density of various allotropes of phosphorous depends upon tendency of polymerization.
Which of the following options is correct?
Which of the following does not belong to group 14?
Although CO is a neutral gas, yet it shows acidic nature or reaction with (at high pressure and temperature)
PbO2 is
As we move down the group, the atomic and ionic radii of elements increase with increase in the atomic number. But the atomic radius of Ga is less than that of Al and there is very little increase in radius from Ga to Tl. This is because of:
Which of the following pairs of elements exhibits only one oxidation state?
The reduction potential of Cr3+ is -0.41 V and that of Mn3+ is +1.51 V. Which of the following can be inferred from the given factual information?
Which lanthanoid forms a compound with cobalt (LnCo5), that has strong magnetic properties?
The correct order of the ionic radii is:
Which of the following does not attribute to the lanthanoid contractions?
Which of the following statements is incorrect?
The group of elements with abnormally low values of IE3 is
Elements like Fe, Co and Ni acquire permanent magnetic moment when placed in a magnetic field. The property is referred to as
The element that does not form an amalgam is
Which of the following statements about interstitial compounds is incorrect?
All of the following are interstitial compounds of transition elements, except
The characteristic that does not contribute to catalytic activities of transition elements is
Monadelphous stamens are formed by the fusion of –
Phyllode is the modification of –
Pappus is modification of -
A typical flower with superior ovary and other floral parts inferior is -
What does a dot on the top of a floral diagram represent?
Reticulate venation is a characteristic in
Vascular bundles in which cambium is present between xylem and phloem is called as
What is the primary function of meristematic tissue in plants?
Exarch xylem is present in
Match the following:
Select the correct option:
Family Fabaceae differs from Solanaceae and Liliaceae. With respect to the stamens, pick out the characteristics specific to family Fabaceae but not found in Solanaceae or Liliaceae.
Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: A flower is defined as modified shoot wherein the shoot apical meristem changes to floral meristem.
Reason R: Internode of the shoot gets condensed to produce different floral appendages laterally at successive node instead of leaves. In the light of the above statements, choose the correct answer from the options given below :
Which of the following statement is not correct?
The type of tissue commonly found in the fruit wall of nuts is:
Match List - I with List - II:
Choose the correct answer from the options given below.
Pineapple (ananas) fruit develops from
The aleurone layer in maize grain is especially rich in
What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells?
Stem modified to perform the function of a leaf and having many internodes is called as
A typical lower with superior ovary and other floral parts inferior is called:
The morphological nature of the edible part of coconut is
Root hairs develop from the region of
Coconut fruit is a
When the margins of sepals or petals overlap one another without any particular direction, the condition is termed as:
An aggregate fruit is one which develops from
In china rose the flower are
Which one of the following organisms is correctly matched with its three characteristics?
The transverse section of a plant part showed polyarch, radial and exarch xylem, with endodermis and pericycle. The plant part is identified as:
Which meristem is found at the tips of roots and shoots?
Consider the following plant tissues:
(A) Axillary buds
(B) Fascicular vascular cambium
(C) Interfascicular cambium
(D) Cork cambium
(E) Intercalary meristem
Identify the lateral meristems among the above.
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: Late wood has fewer xylary elements with narrow vessels.
Reason R: Cambium is less active in winters. In the light of the above statements, choose the correct answer from the options given below :
Given below are two statements:
Statement I: Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.
Statement II: Exarch condition is the most common feature of the root system. In the light of the above statements, choose the correct answer from the options given below:
In a woody dicotyledonous tree, which of the following parts will mainly consist of primary tissues?
In dicot roots, the initiation of the lateral roots and the vascular cambium during the secondary growth takes place in:
In a monocot leaf
Which hormone is primarily responsible for cell elongation in plants?
The Root hair is produced from ________.
Sunken stomata are found in
"Girdling Experiment" was performed by Plant Physiologists to identify the plant tissue through which:
How many plants in the list given below have marginal placentation ? Mustard, Gram, Tulip, Asparagus, Arhar, Sun hemp, Chilli, Colchicine, Onion, Moong, Pea, Tobacco. Lupin
What is the primary function of chlorophyll a in photosynthesis?
Dry indehiscent single-seeded fruit formed by the bi-carpellary syncarpous inferior ovary is
In which part of the plant does nitrogen fixation primarily occur?
Read the following statements about the vascular bundles:
(a) In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii.
(b) Conjoint closed vascular bundles do not possess cambium
(c) In open vascular bundles, cambium is present in between xylem and phloem
(d) The vascular bundles of dicotyledonous stem possess endarch protoxylem
(e) In monocotyledonous root, usually there are more than six xylem bundles present
Choose the correct answer from the options given below:
The alveoli of lungs are lined by:
What is the shape of Haemoglobin-oxygen dissociation curve?
The pharynx opens into the larynx by a slit-like aperture called ______.
Which of the following diseases can be found in workers working in a mill?
Which of the following is not the function of the respiratory system?
Which of the following is NOT a function of the epithelial tissue?
Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of:
Lungs have a large number of narrow tubes called ______.
The lungs are enclosed in a covering called ______.
Which of the following statements is true about Trachea, in a respiratory system?
Which of the following is NOT a method by which CO₂ is transported in the blood?
Which one of the following is the correct statement for respiration in humans?
Given below are few respiratory disorders. Identify occupoational respiratory disorders among these.
(i) Coryza
(ii) SARS
(iii) Silicosis
(iv) Asbestosis
(v) Emphysema
Read the following four statements carefully.
(i) Asthma is a difficulty in breathing causing wheezing due to inflammation of bronchi and bronchioles.
(ii) The part of the respiratory system starting with the external nostrils up to the terminal bronchioles constitutes the respiratory or exchange part of the respiratory system.
(iii) During swallowing epiglottis can be covered by a thin elastic cartilaginous ilap calied glottis to prevent the entry of food into the larynx.
(iv) Binding of oxygen with haemoglobin is primarily related to partial pressure of O2.
Which of the above two statements are correct?
The role of mitosis is not merely to divide a cell into two daughter cells but to ensure genetic continuity from one cell generation to another cell generation.
The mechanism ensuring genetic continuity is
The given figure shows an angiogram of the coronary blood vessel. Which one of the following statements correctly describes, what is being done?
Read the following statements and select the correct ones.
(i) Nodal tissue is specialised cardiac musculature in human heart which has the ability to generate action potential due to an external stimuli
(ii) Position of SAN - right corner of right atrium
(iii) Position of AVN - right corner of ventricle
(iv) AV bundle continues from AVN
(v) Purkinje fibres are modified cardiac muscle fibres that originate from the atrioventricular node and spread into the two ventricles.
Coronary arteries supplies
In the above diagram, which blood vessel represents vena cava?
Rate of heart beat is determined by
What does binomial nomenclature refer to?
What is the nature of blood passing through blood vessels A, B, C and D respectively?
Which of the following sequences is truly a systemic circulation pathway?
Which of the following is the diagrammatic representation of standard electrocardiogram(ECG)?
What would be the cardiac output of a person having 72 heart beats per minute and a stroke volume of 50 ml?
How many double circulations are normally completed by the human heart, in one minute?
Another term for heart attack is
Coronary heart disease is due to
The course of blood from the heart to the lungs and back to the heart is called
The given figure shows the diagrammatic view of human respiratory system. Identify A, B, C and D.
Lungs are enclosed in
Which of the following statements are correct?
A. Basophils are most abundant cells of the total WBCs
B. Basophils secrete histamine, serotonin and heparin
C. Basophils are involved in inflammatory response
D. Basophils have kidney shaped nucleus
E. Basophils are agranulocytes
Match List-I with List-II.
Match List I with List II.
Study the given figure of respiratory passage carefully and identify the parts labelled as A, B, C, D and E.
Rate of breathing is controlled mainly by ________________.
Complete the following sentence by selecting the correct option.
The breathing rhythm is generated in the __(i)__ and is influenced by variation in levels of __(ii)___ in the blood.
What is the role of the diaphragm in breathing?
Systolic pressure is higher than diastolic pressure due to :-
Pace maker influences :-
The blood leaving the lungs is richer than the blood entering the lung in :-
Which one of the following is a matching pair?
What is the primary site for the exchange of gases in the human body?
Which one of the following statements is correct regarding blood pressure?
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